Add tests for create grant when no group

There were no tests that show what happens when you create a grant
(PUT /v3/projects/{project_id}/groups/{group_id}/roles/{role_id}
and /v3/domains/{domain_id}/...) for a group that doesn't exist.
The server returns a 404 Not Found for the group.

bp no-check-id

Change-Id: Iafa051764b46158f2b1175b29c535f5d6fdc251d
Merge "Add tests for create grant when no group"