Move Governance/CoreDefinition into gerrit

At the April 8, 2015 DefCore Scale.11 meeting, the DefCore committee
decided to migrate some existing wiki artifacts into
gerrit.  This patch represents one such migration.  This patch
reproduces content previously housed at the following URL in RST
so that it can be placed more easily in source control:

https://wiki.openstack.org/wiki/Governance/CoreDefinition

Two minor formatting changes have been made to best accommodate the
new RST format:

1. The page title has changed from the old wiki-enforced heading
   "Governance/CoreDefinition" to the more plain-English equivalent
   "Core Definition".  Aside from this change, the text of the document
   is completely unaltered from it's state in the wiki on the day this
   patch was submitted.

2. The placement of the principles image has changed.  It is now
   placed at the top of the Principles section instead of alongside
   the first two principles in the list in order to accommodate those
   reading the RST as raw/unrendered plaintext.

Change-Id: I5aac99478981253e51f68605b5473175fc313eb3

CoreDefinition.rst

@@ -0,0 +1,241 @@
+===============
+Core Definition
+===============
+
+Objective
+=========
+
+The following list represents the "guiding principles" used by the
+Foundation Board to determine how commercial implementations of OpenStack
+can be granted use of the trademark. They will continue to get refined over
+the next 6 months as the to-be-renamed-Core-Definition Committee refines
+the must-pass test selection process and governance. They committee may
+suggest changes to the by-laws to clarify the definition of core.
+
+::
+
+   Principles Adopted at Oct 4th 2013 Board Meeting
+
+Implementation
+==============
+
+* The `Governance/DefCoreCommittee
+  <https://wiki.openstack.org/wiki/Governance/DefCoreCommittee/>`_ is
+  working to manage this.
+* Meetings and agendas will be posted to that page, hosted on Google
+  Hangouts and (generally) open to the community.
+* Meeting participants will be expected to commit to the full set of
+  meetings, be familiar with the Spider process materials, and up-to-date
+  on the committee resolutions to date.
+* Havana must-pass tests approved by Ice House Release Ice House must-pass
+  tests approved by Ice House Release +90
+
+Principles
+==========
+
+.. image:: images/500px-Core_flow.png
+
+1. Implementations that are Core can use OpenStack trademark (OpenStack™)
+
+   1. This is the legal definition of "core" and the why it matters to the
+      community.
+
+   2. We want to make sure that the OpenStack™ mark means something.
+
+   3. The OpenStack™ mark is not the same as the OpenStack brand; however,
+      the Board uses it’s control of the mark as a proxy to help manage the
+      brand.
+2. Core is a subset of the whole project
+
+   1. The OpenStack project is supposed to be a broad and diverse community
+      with new projects entering incubation and new implementations being
+      constantly added. This innovation is vital to OpenStack but separate
+      from the definition of Core.
+
+   2. There may be other marks that are managed separately by the
+      foundation, and available for the platform ecosystem as per the
+      Board’s discretion
+
+   3. "OpenStack API Compatible" mark not part of this discussion and
+      should be not be assumed.
+
+3. Core definition can be applied equally to all usage models
+
+   1. There should not be multiple definitions of OpenStack depending on
+      the operator (public, private, community, etc)
+
+   2. While expected that each deployment is identical, the differences
+      must be quantifiable
+
+4. Claiming OpenStack requiring use of designated upstream code
+
+   1. Implementation’s claiming the OpenStack™ mark must use the OpenStack
+      upstream code (or be using code submitted to upstream)
+
+   2. You are not OpenStack, if you pass all the tests but do not use the
+      API framework
+
+   3. You are not OpenStack, if you pass all the tests but do not use the
+      API framework
+
+   4. This also surfaces bit-rot in alternate implementations to the larger
+      community
+
+   5. This behavior improves interoperability because there is more shared
+      code between implementation
+
+5. Projects must have an open reference implementation
+
+   1. OpenStack will require an open source reference base plug-in
+      implementation for projects (if not part of OpenStack, license model
+      for reference plug-in must be compatible).
+
+   2. Definition of a plug-in: alternate backend implementations with a
+      common API framework that uses common _code_ to implement the API
+
+   3. This expects that projects (where technically feasible) are expected
+      to implement a plug-in or extension architecture.
+
+   4. This is already in place for several projects and addresses around
+      ecosystem support, enabling innovation
+
+   5. Reference plug-ins are, by definition, the complete capability set.
+      It is not acceptable to have "core" features that are not functional
+      in the reference plug-in
+
+   6. This will enable alternate implementations to offer innovative or
+      differentiated features without forcing changes to the reference
+      plug-in implementation
+
+   7. This will enable the reference to expand without forcing other
+      alternate implementations to match all features and recertify
+
+6. Vendors may substitute alternate implementations
+
+   1. If a vendor plug-in passes all relevant tests then it can be
+      considered a full substitute for the reference plug-in
+
+   2. If a vendor plug-in does NOT pass all relevant test then the vendor
+      is required to include the open source reference in the
+      implementation.
+
+   3. Alternate implementations may pass any tests that make sense
+
+   4. Alternate implementations should add tests to validate new
+      functionality.
+
+   5. They must have all the must-pass tests (see #10) to claim the
+      OpenStack mark.
+
+   6. OpenStack Implementations are verified by open community tests
+
+   7. Vendor OpenStack implementations must achieve 100% of must-have
+      coverage?
+
+   8. Implemented tests can be flagged as may-have requires list [Joshua
+      McKenty]
+
+   9. Certifiers will be required to disclose their testing gaps.
+
+   10. This will put a lot of pressure on the Tempest project
+
+   11. Maintenance of the testing suite to become a core Foundation
+       responsibility. This may require additional resources
+
+   12. Implementations and products are allowed to have variation based on
+       publication of compatibility
+
+   13. Consumers must have a way to determine how the system is different
+       from reference (posted, discovered, etc)
+
+   14. Testing must respond in an appropriate way on BOTH pass and fail
+       (the wrong return rejects the entire suite)
+
+7. Tests can be remotely or self-administered
+
+   1. Plug-in certification is driven by Tempest self-certification model
+
+   2. Self-certifiers are required to publish their results
+
+   3. Self-certified are required to publish enough information that a 3rd
+      party could build the reference implementation to pass the tests.
+
+   4. Self-certified must include the operating systems that have been
+      certified
+
+   5. It is preferred for self-certified implementation to reference an
+      OpenStack reference architecture "flavor" instead of defining their
+      own reference. (a way to publish and agree on flavors is needed)
+
+   6. The Foundation needs to define a mechanism of dispute resolution. (A
+      trust but verify model)
+
+   7. As an ecosystem partner, you have a need to make a "works against
+      OpenStack" statement that is supportable
+
+   8. API consumer can claim working against the OpenStack API if it works
+      against any implementation passing all the "must have" tests(YES)
+
+   9. API consumers can state they are working against the OpenStack API
+      with some "may have" items as requirements
+
+   10. API consumers are expected to write tests that validate their
+       required behaviors (submitted as "may have" tests)
+
+8. A subset of tests are chosen by the Foundation as "must-pass"
+
+   1. How? Read the `Governance/CoreCriteria <./CoreCriteria.rst/>`_ Selection
+      Process
+
+   2. An OpenStack body will recommend which tests are elevated from
+      may-have to must-have
+
+   3. The selection of "must-pass" tests should be based on quantifiable
+      information when possible.
+
+   4. Must-pass tests should be selected from the existing body of
+      "may-pass" tests. This encourages people to write tests for cases
+      they want supported.
+
+   5. We will have a process by which tests are elevated from may to must
+      lists
+
+   6. Potentially: the User Committee will nominate tests that elevated to
+      the board
+
+   7. OpenStack Core means passing all "must-pass" tests
+
+9. The OpenStack board owns the responsibility to define 'core' – to
+   approve 'musts'
+
+   1. The "CoreDef" committee will submit the must-pass tests to the board
+      as a block and passed as a single motion
+
+   2. We are NOT defining which items are on the list in this effort, just
+      making the position that it is how we will define core
+
+   3. May-have tests include items in the integrated release, but which are
+      not core.
+
+   4. Must haves – must comply with the Core criteria defined from the
+      IncUp committee results
+
+   5. Projects in Incubation or pre-Incubation are not to be included in
+      the 'may' list
+
+10. OpenStack Core means passing all "must-pass" tests
+
+    1. The OpenStack board owns the responsibility to define 'core' – to
+       approve 'musts'
+
+    2. We are NOT defining which items are on the list in this effort, just
+       making the position that it is how we will define core
+
+    3. May-have tests include items in the integrated release, but which
+       are not core.
+
+    4. Must haves – must comply with the Core criteria defined from the
+       IncUp committee results
+
+    5. Projects in Incubation or pre-Incubation are not to be included in
+       the 'may' list