UC2 update with Openstack SDK interface and common test logic

UC2 update with Openstack SDK interface and common test logic

JIRA: AUTO-13

1) Openstack SDK usage for VM suspend/resume actions, using clouds.yaml,
tested on hpe16 pod
2) common test logic (creation of test execution instances, measurement of
recovery time, calling of per-use case indexed functions, saving results
to CSV files)

Change-Id: If84d2a0e44618d476a028d4ac4a2897da9cd5532
Signed-off-by: Gerard Damm <gerard.damm@wipro.com>
(cherry picked from commit a5ff1317e4b3be39aaaec22716b438c6c12c5652)