RBD unit test improvements

This commit brings the implementation of the test_rbd and
test_backup_ceph unit tests more inline and tries to ensure
that no mock is set without being unset so as not to tread
on the toes of any other tests.

Change-Id: Ibb6bd3bf90952914512e3fa39fd216f43f0f8ecb
Closes-bug: 1276657
Brick connector fix for GlusterFS

Fixes an InvalidParameterValue error by passing the required
information to Brick for mounting.

See also: 1cd3626 Brick connector revised fix for NFS

Bump driver version 1.1.1.

Closes-Bug: 1238085

Change-Id: Ie45889460dd4775a556d592161c98c24a56989c7
Validate the quota in the API layer for volume extend

The user needs a friendly message feedback if the quota exceeds when
the volume is about to extend.

Change-Id: Ifd523ac5e9039861cf87711dc5c4842b5cb524c2
Closes-Bug: #1256763
Merge "RBD unit test improvements"
Merge "Brick connector fix for GlusterFS"
Merge "Validate the quota in the API layer for volume extend"