Fix backup unit tests imports for os-brick
Fix backup unit tests imports for os-brick

This patch updates the previous fix for the new location for
the FakeConnector.  The imports were broken.

Change-Id: I9e6a15ae4cb33d18c622d0d010722ae3aea431f7
Partial-Bug: 1618697

cloudbase/cinder,Hybrid-Cloud/cinder,phenoxim/cinder,eharney/cinder,mahak/cinder,ge0rgi/cinder,phenoxim/cinder,NetApp/cinder,eharney/cinder,openstack/cinder,Nexenta/cinder,cloudbase/cinder,mahak/cinder,j-griffith/cinder,NetApp/cinder,Hybrid-Cloud/cinder,openstack/cinder,Nexenta/cinder,Datera/cinder,Datera/cinder,j-griffith/cinder