Cinder storage pools tests

Cinder allows to lists all back-end storage pools that are known
to the scheduler service.

Added cinder api for show_pool command
Add a testcase:
 - Create a volume
 - Verify that pool name matches to volume host attribute

Change-Id: I6b4a1f8b909764cd7c42dd06bea1d41655b29a52
2 files changed