Add OSTF to the 'migrate_vm_backed_with_ceph' test

Performing of OSTF checks was missed after 
environment deployment is done and it should be added
to the test as described in the scenario.

Change-Id: Ie06f76b462bf236fd06998d0236f90cbff792afb
Closes-Bug: #1324567
Merge "Add OSTF to the 'migrate_vm_backed_with_ceph' test"