Bump oslo.rootwrap to 1.3.0.0a1 for Cinder

Cinder already requires oslo.rootwrap 1.3.0 filters so we need to
bump requirements accordingly.

This will fix a variety of rootwrap warnings that can occur when using
the new cgroups features.

Change-Id: Ia72444d054a35c3dbb34c24dbefe8f05cdebbd33
Closes-bug: #1340877
Introduce iSCSI driver for Pure Storage FlashArray

This patch introduces an iSCSI driver for Pure Storage FlashArray to Cinder.
It impliments all required features.

Certification test results:
    https://bugs.launchpad.net/cinder/+bug/1347109

Change-Id: I25f465b4abfc19d9b2717ec095c65201e76beab9
Impliements: blueprint pure-iscsi-volume-driver
Fixes migrate_volume_completion

The following issues are addressed:

The source volume is never deleted when a migration is done because
status_update was assumed to always be a dict.

Unattached volumes are set to in-use when retyped.

In-use migrated volumes are left in status attaching.

Change-Id: Ib5034679a5f469ba53e6280a47e8c94d633cf911
Partial-Bug: 1316079
Change 3PAR delete message when volume is busy

This patch traps for when a volume is busy at
delete time.   It then logs a more useful message
and raises a VolumeIsBusy exception.

Change-Id: I689c1a5ff5e2d4c748a98615f5610a029a027e35
Closes-Bug: 1349636
Add note that some checks are disabled on purpose

Change-Id: I9a2daf57a8bb73e292d99f5177c310d75061cc13
Merge "Bump oslo.rootwrap to 1.3.0.0a1 for Cinder"
Merge "Introduce iSCSI driver for Pure Storage FlashArray"
Merge "Fixes migrate_volume_completion"
Merge "Add note that some checks are disabled on purpose"
Merge "Change 3PAR delete message when volume is busy"