Add support for new Vertica datastore in Trove

This is to add a new Vertica datastore for Trove in addition to the
existing datastores supported currently.
The guestagent for this will include some of the basic functions
like launch, terminate, resize instance.

Change-Id: I0782cac5d7325f95daac259eb6400106a027e541
Implements: blueprint vertica-db-support

specs/kilo/vertica-datastore.rst

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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+..
+
+===============================
+Add Vertica datastore for Trove
+===============================
+
+Launchpad blueprint:
+
+https://blueprints.launchpad.net/trove/+spec/vertica-db-support
+
+Problem Description
+===============================
+
+The aim of this blueprint is to enable Trove to support a new datastore type -
+HP Vertica 7.1 CE on Ubuntu.
+
+Proposed Change
+===============================
+To add support for this new datastore, we need to implement the following:
+
+- Add a new diskimage-builder element for Vertica
+
+- Implement the various datastore features like::
+
+    - Launch
+    - Reboot
+    - Terminate
+    - Resize
+
+Configuration
+---------------
+A new configuration group for Vertica and the different configuration options specific
+to Vertica in trove/common/cfg.py.
+
+Some of the examples for the configuration options are::
+
+    - tcp_ports
+    - udp_ports
+    - backup_strategy
+    - backup_incremental_strategy
+    - replication_strategy
+    - backup_namespace
+    - restore_namespace
+    - root_on_create
+    - mount_point
+    - volume_support
+    - device_path
+
+Database
+------------
+None
+
+Public API
+------------
+None
+
+Internal API
+------------
+None
+
+Guest Agent
+------------
+- This requires implementing the various datastore feature for Vertica like Launch, Reboot, Terminate, Resize.
+- This will include adding the following files specific to Vertica under the guestagent/datastore module::
+
+    - manager.py
+    - service.py
+    - system.py
+
+These changes will not affect the behavior of the guestagent or its interaction with other components.
+
+Disk-Image-Builder Elements
+---------------------------
+- Disk-Image-Building would be a 2-step process, basically::
+
+    - Download the Vertica package.
+    - Execute the image-builder
+
+- CE is the free edition of HP Vertica database available at www.vertica.com
+- One needs to go through a free registration process, which enables a user to download the Vertica package.
+
+- Image-building elements would expect user to copy $VERTICA_PACKAGE_FILE at $VERTICA_SOURCE.
+- It would be then the job of DIB elements to::
+
+    - Copy $VERTICA_PACKAGE_FILE from $VERTICA_SOURCE and host in the guest-image.
+    - Install the essential requisite packages.
+    - Install the Vertica package to guest-image.
+    - Create the Vertica dba user named as "dbadmin", with desired group and path & time-zone settings setup to profile.
+    - Create a base location to host database files.
+
+Implementation
+===============================
+
+Assignee(s)
+-----------
+- sushil.kumar3@hp.com (Primary Assignee)
+- saurabh.surana@hp.com
+- jonathan.halterman@hp.com
+
+Milestones
+----------
+"Kilo-3"
+
+Dependencies
+============
+None
+
+Testing
+=======
+- Vertica datastore would be tested using a 3rd party CI hosted by HP.
+- New unit tests would be added for the Vertica guestagent.
+- Integration tests needs to be added for end-to-end feature testing::
+
+    - create/delete instance
+    - resize instance
+
+Documentation Impact
+====================
+- Documentation would need the update on::
+
+    - HP Vertica being added as new datastore.
+    - Capabilities of Trove for HP Vertica datastore.
+    - How to build the guest-image required for hosting HP Vertica guest.
+
+References
+==========
+[1] https://my.vertica.com/docs/7.1.x/HTML/index.htm
+
+[2] https://my.vertica.com/download-community-edition/#EE
+
+[3] https://my.vertica.com/hp-vertica-community-edition-software-license-agreement/