Add tests for vm backed with Ceph live migration

Added OpenStackActions class to perform common
OpenStack operations, such as creating
servers, migrating them, making some basic
checks;

Added basic test for verification of live
migration of VMs backed with Ceph;

Change-Id: If5789338f68ad35151175afe29830fb9b75f7ecf
Closes-bug: #1261336
Merge "Add tests for vm backed with Ceph live migration"