Enforce ordering of imports with H306.

For tests, this is mostly done by grouping test
imports after other cinderclient imports.

Change-Id: Ie40fda014d1aedb057e5b4ea1f27f999c84e6373

The self.name is undefined in the Capabilities class.
And also there is no need any unique information to
identify this object, so we just remove it directly.

Change-Id: I0b821345c0d4c9a4636b9d097b9a66ba59768092
Partial-Bug: #1585024

Added request_ids attribute to resource object for all the
cgsnapshots, consistencygroups, qos_specs, quota_classes,
quotas and services APIs by updating following APIs:

cgsnapshots: delete, update
consistencygroups: delete, update, create
qos_specs: delete, associate, disassociate, disassociate_all
quota_classes: update
quotas: update
services: enable, disable, disable_log_reason

These changes are required to return 'request_id' from client to
log request_id mappings of cross projects.

For more details on how request_id will be returned to the caller,
please refer to the approved blueprint [1] discussed with the
cross-project team.
[1] http://specs.openstack.org/openstack/openstack-specs/specs/return-request-id.html

DocImpact
'request-ids' will be returned as an attribute with response object.
User can access it using 'res.request_ids' where 'res' is a
response object.

Change-Id: I7b399512fcec9ecd31938656deb60e325bb76ad4
Partial-Implements: blueprint return-request-id-to-caller

This change adds a new admin-api to allow admin to fetch
specified backend capabilities which includes volume stats and
vendor unique properties.
With this command, admin can obtain what the current deployed
backend in Cinder is able to do from the endpoint.

DocImpact
Implements: blueprint get-volume-type-extra-specs

Change-Id: I355a5b57994d1407a088c86530d7ef362ecd31ed