Reuse already registerd oslo config groups in tempest plugin

[Nishant Kumar]

This bug addresses two of the config groups that are being created in tempest plugin for cinder. Instead of
registering new groups we can reuse already registered groups in tempest/config.py.

Changes should be made to the following groups:

a) service_available_group - We don't need this group in plugin code because it is already being registered in tempest code and service availability is being checked for in the /tempest/api/volume/base.py and the test cases in plugin code inherits this base.py

b) cinder group - Instead of registering a new cinder group for plugin tests we can add plugin specific configuration options in the existing volume group as the same conf object from tempest is being passed on to the plugin.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/375808

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/375808
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=4e1643ea5b13867c0c5adebca26112a8c804e4b6
Submitter: Jenkins
Branch: master

commit 4e1643ea5b13867c0c5adebca26112a8c804e4b6
Author: Nishant Kumar <email address hidden>
Date: Fri Sep 23 20:11:58 2016 +0530

    Reuse already existing groups in tempest plugin

    Instead of registering new groups we can reuse already registered
    groups in tempest/config.py.

    Changes should be made to the following groups:

    a) service_available_group - We don't need this group in plugin code
    because it is already being registered in tempest code and service
    availability is being checked for in the /tempest/api/volume/base.py
    and the test cases in plugin code inherits this base.py

    b) cinder group - Instead of registering a new cinder group for plugin
    tests we can add plugin specific configuration options in the existing
    volume group as the same conf object from tempest is being passed on
    to the plugin

    Change-Id: Ie0ca52ec389c581ca47db3e9bbb0793a2bb47fdf
    Closes-Bug: #1626575

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 10.0.0.0b3 development milestone.