3PAR driver doesn't remove all VLUNs after a volume detach in some situations

[Dmitry Sutyagin]

Backport request for an upstream bug - https://bugs.launchpad.net/cinder/+bug/1469816

[Vitaly Sedelnik (vsedelnik)]

Medium importance inherited from the upstream bug.

Invalid for 8.0 as the fix is merged to liberty and should appear in 8.0 via code sync.
Confirmed for 7.0-updates and targeted to 7.0-mu-2.

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: openstack-ci/fuel-7.0/2015.1.0
Change author: Anthony Lee <email address hidden>
Review: https://review.fuel-infra.org/14290

[Sergii Rizvan (srizvan)]

We have backported patch for 7.0, because it was tested on customer's 3PAR hardware.

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/14290
Submitter: Vitaly Sedelnik <email address hidden>
Branch: openstack-ci/fuel-7.0/2015.1.0

Commit: 3b62f173f1c8d7922b8caebb87f95dc5f02834f3
Author: Anthony Lee <email address hidden>
Date: Mon Nov 30 14:43:44 2015

Improve 3PAR driver VLUN creation and deletion

This patch improves the creation and deletion logic for VLUNs
for the 3PAR drivers. The changes will help to prevent VLUNs
from being left behind after volume detaches. It also prevents
extra VLUNs being created when initialize_connection is called
multiple times for the same volume and host.

Closes-Bug: #1516584
Change-Id: I497564cb4bd661252570eb2e69962f7d5f3c07da
(cherry picked from upstream commit 64998f1c8c12a2c8575b0b7027e010955c2203eb)

[Sergii Rizvan (srizvan)]

Verified on 7.0 on Ubuntu:
Packages:
cinder-api 1:2015.1.1-1~u14.04+mos3054
cinder-common 1:2015.1.1-1~u14.04+mos3054
cinder-scheduler 1:2015.1.1-1~u14.04+mos3054
cinder-volume 1:2015.1.1-1~u14.04+mos3054
python-cinder 1:2015.1.1-1~u14.04+mos3054