[Bug 1065702] Fix merged to nova (stable/folsom)

[OpenStack Hudson]

Reviewed:  https://review.openstack.org/15005
Committed: http://github.com/openstack/nova/commit/e3d7f8c7de9bad73bf1f9b5ee9b2cf46eb452351
Submitter: Jenkins
Branch:    stable/folsom

commit e3d7f8c7de9bad73bf1f9b5ee9b2cf46eb452351
Author: John Griffith <john.griffith at solidfire.com>
Date:   Mon Oct 29 17:57:40 2012 -0600

    Detect and fix issues caused by vol ID migration
    
    The migration from volume ID to UUID neglected to update the provider_location
    field on the volume.  As a result the iqn and volume name no long match and
    existing volumes are no longer able to be attached after an upgrade
    (essex -> folsom and then nova-vol->cinder).
    
    This patch adds a method to the volume driver that will check for the
    mismatch of volume name in the iqn during service start up.  If
    detected it will update the provider_location field in the database
    to include the new ID.  Also it will create a symlink to the device backing
    file that also has the correct naming convention.
    
    Note: We don't disturb an connections that are currently attached.
    For this case we add a check in manager.detach and do any provider_location
    cleanup that's needed at that time.  This ensures that connections
    persist on restarts of tgtd and reboot.
    
    Change-Id: Ib41ebdc849ebc31a9225bdc4902209c5a23da104
    Fixes: bug 1065702

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https://bugs.launchpad.net/bugs/1065702

Title:
  After folsom upgrade, instances can no longer access existing volumes.

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