Lefthand retains initiator names of servers even after last volume deleted.

[Sean Severson]

When Cinder deletes the last volume on a Left Hand array, the array retains the initiator name of the associated host. This leads to authorization errors later down the road if the hostname is reused but the initiator changes, such as in the case of an OS reinstall.

Steps to reproduce:
1. Configure Cinder to use a LeftHand.
2. Create any number of volumes.
3. Delete all of the created volumes.
4. Log onto the array with the CMC.
5. Observe the list of servers under the array name.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/124145

[Mike Perez (thingee)]

Tried pinging Walt and Kurt about this on IRC, but didn't get an answer. Going to retarget to k-2.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/124145
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=891aa3c6024bc68a2434a24244b66b3dc9942bb3
Submitter: Jenkins
Branch: master

commit 891aa3c6024bc68a2434a24244b66b3dc9942bb3
Author: Anthony Lee <email address hidden>
Date: Thu Sep 25 05:10:05 2014 -0700

    Fixed server name being retained after detach in LeftHand

    There was an issue with the LeftHand driver where the
    initiator names of servers were not being removed when the last
    volume attached to that server was detached.

    This fix will now remove the server from the LeftHand backend
    when no more volumes are attached to it.

    Closes-Bug: #1353137
    Change-Id: I58be39d14979e1d3966232095cb49693c1424f8a