Dell SC volume_stats could use uninitted vars

[Tom Swanson]

In _update_volume_stats in dell_storagecenter_common.py totalcapacitygb and freespacegb are not necessarily initialized. Should be data['total_capacity_gb'] and data.get('free_capacity_gb').

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/187736

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/187736
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=a9be9c9735a07db163e843222cae9075864e1ef0
Submitter: Jenkins
Branch: master

commit a9be9c9735a07db163e843222cae9075864e1ef0
Author: Tom Swanson <email address hidden>
Date: Tue Jun 2 14:20:55 2015 -0500

    Dell SC: update_volume_stats could use uninitialized vars

    In _update_volume_stats in dell_storagecenter_common.py totalcapacitygb
    and freespacegb are not necessarily initialized in the LOG.debug call.
    Changed to data['total_capacity_gb'] and data['free_capacity_gb'].

    Also initialized to total_capacity_gb and free_capacity_gb dict entries
    to 'unavailable' which allowed the removal of two conditionals in the
    same function.

    Change-Id: Ib699e0d1cf67645298628aa96656888193843509
    Closes-Bug: #1461230