Add some cases about volume-create and volume-rename

Add some test cases
  * create volume when name is none
  * create volume when description contains specific characters
  * create volume with availability_zone
  * rename volume when name is same with original value
  * rename volume when name is duplicated
With these case, volume tempest can be more comprehensive.

Change-Id: I543070a74c237451aa6268b8c2f903b13adce8dc
Merge "Add some cases about volume-create and volume-rename"