Dell SC driver only honoring vol folder name on create

[Tom Swanson]

The dell_sc_volume_folder cinder.conf option for the Dell Storage Center iSCSI and FC drivers is only honored on volume creation. If the volume was duplicated with the same name the driver would use the first volume it found regardless of its location.

This should be changed to use the volume found in dell_sc_volume_folder if there is one before searching the rest of the array.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/177994

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/177994
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=5a5b9ca3ed013dd6cfcda393709c4e130ee3a9ab
Submitter: Jenkins
Branch: master

commit 5a5b9ca3ed013dd6cfcda393709c4e130ee3a9ab
Author: Tom Swanson <email address hidden>
Date: Mon Apr 27 17:33:40 2015 -0500

    Dell SC driver honoring folder name after volume creation.

    The Dell SC driver was not honoring the volume folder name
    after creation. This has been changed so that find_volume
    now checks the dell_sc_volume_folder for the requested volume
    before doing a general search of the storage center. In
    either case if more than one volume is returned (two in
    the dell_sc_volume_folder or two outside of that folder) then
    an exception is thrown.

    Also the dell_sc_volume_folder, dell_sc_server_folder and
    dell_sc_ssn variables are no longer being passed arond. They
    are saved as part of the backend API object.

    Tests have been updated.

    Change-Id: I962ea3ed262d21deff65cdc8476939aab6ba07e2
    Closes-Bug: #1449290