Delete consistency group failed

[Xing Yang]

In recent testing, delete CG failed because it compares host@backend with host@backend#pool (in delete_consistencygroup in volume/manager.py). So extract_host needs to be called to fix this problem.

Another issue is about deleting a CG with no host. This will throw exception when extract_host(group['host']) is called in delete_consistencygroup in volume/rpcapi.py. The solution is to check the host field in consistencygroup/api.py and delete it from db there.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/119493

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/119493
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=764c5ec749821d36bb0215dc6002d3caea95d3b1
Submitter: Jenkins
Branch: master

commit 764c5ec749821d36bb0215dc6002d3caea95d3b1
Author: Xing Yang <email address hidden>
Date: Fri Sep 5 17:48:00 2014 -0400

    Delete consistency group failed

    Delete CG failed because it compares host@backend with host@backend#pool
    (in delete_consistencygroup in volume/manager.py). The fix is to call
    extract_host before doing the comparison.

    Another issue is about deleting a CG with no host. This will throw exception
    when extract_host(group['host']) is called in delete_consistencygroup in
    volume/rpcapi.py. The solution is to check the host field in consistencygroup/
    api.py and delete it from db there.

    Change-Id: Ife28a4f91bd8a4e123c74dac9748ee31cc7b7306
    Closes-Bug: #1366205