PureISCSIDriver sends volume into "Error_Deleting" state during "delete_volume" operation if volume already deleted

[Mudassir Latif]

In cases where the volume is deleted directly without using Horizon or any other OpenStack tool (Note: not recommended). OpenStack becomes out of sync with reality. An operation to delete the volume results in array returning "Volume does not exist" error.
The driver should discriminate between other general errors and "Volume does not exist" error and treat the volume as deleted successfully.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/136954

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/136954
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=0d47799beaad6fb390c4761fef8d84d665f9b189
Submitter: Jenkins
Branch: master

commit 0d47799beaad6fb390c4761fef8d84d665f9b189
Author: Mudassir Latif <email address hidden>
Date: Mon Nov 24 19:00:47 2014 -0800

    PureISCSIDriver:Handle delete called on already deleted volume

    If the delete_volume method gets an error from Purity
    saying volume does not exist, don't proceed with attempt
    at deletion

    Change-Id: I2a830e43c876433da4cdb50eabe4fb66b7eb6faf
    Closes-Bug: #1395826