Dell FC Driver broken, no longer called

[Sean McGinnis]

Commit 610c672998c87e2bf2f919a4fdea86749c748a1f (https://review.openstack.org/#/c/151353/22) changed the behavior of the system that exposed a problem with the Dell Storage Center fibre channel driver.

After this commit, all third party CI test runs for this driver started failing. The overridden get_volume_stats call was not being hit, causing problems and making the backend unavailable.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/163075

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/163075
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=5b7c123056b9f6b91b3a4cff776916e1ebdbfd99
Submitter: Jenkins
Branch: master

commit 5b7c123056b9f6b91b3a4cff776916e1ebdbfd99
Author: Sean McGinnis <email address hidden>
Date: Tue Mar 10 11:20:25 2015 -0500

    Dell FC driver inheritance order causing failures

    After commit 610c672998c87e2bf2f919a4fdea86749c748a1f merged
    the third party CI test runs for the Dell Storage Center fibre
    channel driver started failing. This appeared to be a change
    in get_volume_stats calls.

    After isolating the cause of this problem it was identified
    that the order of the inherited classes for the driver was
    resulting in the wrong overridden get_volume_stats call to be
    called.

    This patch fixes this be just switching the order of the two
    parent classes DellCommonDriver and FibreChannelDriver. Swapping
    these two results in the correctly overridden call to be made
    and CI tests to pass successfully.

    Change-Id: I58ec1fde585179037aeca8d449e74d0333fb013d
    Closes-Bug: 1430421