Add pagination support to other resources

In Liberty release, we have added pagination
to backups and snapshot as per bp:
https://blueprints.launchpad.net/cinder/+spec/extend-limit-implementations.
There are still some work that hasn't been done yet.

In Mitaka, we intend to add pagination support to
CG, volume type and Qos specs.

Implements: blueprint add-pagination-to-other-resource
Change-Id: Ibd5fe91981d111c3c6a961676b829c3da4fc0c55

specs/mitaka/add_pagination_to_other_resources.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 Pagination To Other Resources
+==========================================
+
+https://blueprints.launchpad.net/cinder/+spec/add-pagination-to-other-resource
+
+This spec aims to continue the work that we did in Liberty, adding pagination
+support to other cinder resources.
+
+
+Problem description
+===================
+
+In Liberty release, we have added pagination to backups and snapshots
+according bp[1]. There are still some work that hasn't been done yet.
+In Mitaka, we intend to add pagination support to CG, Volume Type and
+Qos specs.
+
+Use Cases
+=========
+
+In large scale cloud systems, end users and manage system that's on top of
+Cinder could make quick querying by using pagination, filter and sort
+functions to improve performance of querying.
+
+Proposed change
+===============
+
+* Consistency Group: Refactor current implementation, using DB pagination
+  querying, and add support to filter and sort in querying request.
+* Volume Type: Add pagination and sort support in querying request.
+* Qos Specs: Add pagination, filter and sort in querying request.
+* Add sql pagination querying support as we did in backup and snapshot.
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None
+
+
+REST API impact
+---------------
+
+According the API-wg guideline about pagination, filter and sort[2].
+* GET /v2/{project_id}/{resource}?limit=xxx&marker=xxx&sort=xxx&{filter}=xxx
+  RESP BODY: {"resource_links": [{xxx}],
+              "resource": [{xxx}, {xxx}, ..., {xxx}]
+             }
+
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+None
+
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  wanghao<wanghao749@huawei.com>
+
+Other contributors:
+  None
+
+Work Items
+----------
+
+* Add pagination support to three resources.
+  * Implement code in db pagination query.
+  * Implement code in list querying api.
+  * Test code.
+* Update cinderclient to support this functionality for those resources.
+* Add change to API doc.
+
+
+Dependencies
+============
+
+None
+
+
+Testing
+=======
+
+Both unit and Tempest tests are needed to be created to cover the code change.
+
+
+Documentation Impact
+====================
+
+The cinder API documention will need to be updated to reflect the REST
+API changes.
+
+
+References
+==========
+[1]https://blueprints.launchpad.net/cinder/+spec/extend-limit-implementations
+[2]https://github.com/openstack/api-wg/blob/master/guidelines/pagination_filter_sort.rst