Porting Meniscus Tenant API smoke tests and fixtures

Change-Id: Ib243db4285db63021d234db95e6b417538c332c3
Added checks for metadata to test_create_image

* Added checks for provided metadata
* Added checks for inherited metadata

Change-Id: I7ff5dea6a45df51794e992861367b250643f8ce4
Merge "Added checks for metadata to test_create_image"
Merge "Porting Meniscus Tenant API smoke tests and fixtures"