Use right body for test_create_missing_specs_name

Since the test is `test_create_missing_specs_name`, we should define
the the body like `body = {'qos_specs': {'a': 'b'}}`. And add a test
to cover the invalid body case.

Change-Id: Ib1cf9a8b5bfddc0091e28e3765a36c75044642f3
Closes-bug: #1370308
Merge "Use right body for test_create_missing_specs_name"