Remove steps for unallocated space check

Removed invocation of method that checks that
there is no unallocated space on controller node
when Ceph for Glance is used.

Closes-Bug: #1297364

Change-Id: Id843fdb148316494a9edd3b359f1583eae777b2e
Related-Bug: #1306625
Merge "Remove steps for unallocated space check"