Dell SC: Fail to create volume from cgsnapshot

[Tom Swanson]

create_volume_from_snapshot does not create a volume if the snapshot was part of a consistency group snapshot. The volume snapshot cannot be found.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/201685
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=f3aee27a2298ec08bc2ea817207bef6afaa066eb
Submitter: Jenkins
Branch: master

commit f3aee27a2298ec08bc2ea817207bef6afaa066eb
Author: Tom Swanson <email address hidden>
Date: Tue Jul 14 12:21:19 2015 -0500

    Dell SC: Fix Consistency Group issues

    The Dell Storage Center driver was not honoring the consisgroup_id
    in the volume object in volume creation. Updated create_volume,
    create_cloned_volume and create_volume_from_snapshot to honor this
    value.

    The driver was also not checking that volumes were initialized prior
    to snapshotting a consistency group. The Dell backend does not
    actually create the volumes until there is data or the volumes are
    mapped to a server.

    On create_volume_from_snapshot the driver was not checking for
    cgsnapshot_id before snapshot_id.

    Changed from calling the db to update snapshots to retrieving
    the SnapshotList() object.

    In addition some tests were not checking results. Fixed that.

    Change-Id: I896f7438c0b98003aa345ca1c3841aba8835cc2a
    Closes-Bug: #1474062
    Closes-Bug: #1474105
    Closes-Bug: #1475016