Allow snapshot_delete for NFS/GlusterFS drivers

RemoteFsDriver should allow snapshot_delete, since snapshot_create
for NFS and GlusterFS volumes will create a snapshot in the error
state which cannot be deleted afterward.

snapshot_delete() should allow this to be removed rather than
throwing NotImplementedError.

Fixes bug: 1156686

Change-Id: I4307878fa97fbce5bd733a83fa172509e2fba8ce
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
remove cinder-rtstool because of rtslib dep

rtslib is AGPL, so cinder-rtstool is defacto AGPL by importing it.
Remove cinder-rtstool from the OpenStack repository.

Fixes bug #1157091

Change-Id: I30c9ee19d43107fa7f2e5e65d69049b8d69d2bdf
Merge "remove cinder-rtstool because of rtslib dep"
Merge "Allow snapshot_delete for NFS/GlusterFS drivers"
Merge "Fix Storwize/SVC LUN allocation with holes."