Copy image to volume sometimes fails for EMC driver.

[Xing Yang]

VNX array has two storage processors and it is doing load balancing when attaching a LUN to a host. The storage processor used to attach a LUN to a host is different from the one discovered by the driver sometimes, causing Copy Image to Volume to fail.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/23357

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/23357
Committed: http://github.com/openstack/cinder/commit/2870a287406820fff5f5f36bd53e3ebeed2945f2
Submitter: Jenkins
Branch: master

commit 2870a287406820fff5f5f36bd53e3ebeed2945f2
Author: Xing Yang <email address hidden>
Date: Sun Mar 3 00:06:29 2013 -0500

    Fixed copy image to volume and clone volume.

    This patch fixed the following issues in EMC driver found during G3 testing:
    1. VNX array has two storage processors and it is doing load balancing when
    attaching a LUN to a host. The storage processor used to attach a LUN to a
    host is different from the one discovered by the driver sometimes, causing
    Copy Image to Volume to fail.
    2. The clone relationship is removed after a volume is successfully
    cloned. However, this happens too soon sometimes before the cloned volume
    is fully synced with the source volume. The fix is to wait until it is
    fully synced.

    Change-Id: I5b8fab263723c47faf30b950a611c5bde7f29092
    Fixes: bug #1135221