Update Cinder's latest copy of OSLO grizzly stable

This patch updates all the files from oslo under
stable/grizzly but policy.py.  policy.py is a high risk
change at this date and it has lots of changes since the
last time we updated it.

Fixes bug #1157126

Change-Id: I399a1cd8474f718ed5196def90d2fea546fb01f5
(cherry picked from commit eae0264782818342c222c18b549e9cda354c867b)
Fix Storwize/SVC LUN allocation with holes.

The Storwize/SVC driver should find the first unused LUN, but
continues searching, returning erroneous results.  Added 'break'
statement to fix.

Change-Id: Ibd95714e086a513a39fe9d20ffec57135dc5ec55
Fixes: bug 1157012
(cherry picked from commit e0878c86207d5ff5c2ebaa69eac454af545925ef)
Merge "Update Cinder's latest copy of OSLO grizzly stable" into milestone-proposed
Merge "Fix Storwize/SVC LUN allocation with holes." into milestone-proposed