Enhance testcase for failed resource deletion

Verified that the test_access_key_no_user testcase
was valid for bug/1155824 and made a small enhancement
to verify the final resource state.

Change-Id: I63c6d1b37166b24cedd18bf6cae3d0aae0b18fa6
Implements: failed resource deletion testcase
Fixes: bug #1156375
Remove all references to nose

Now that testtools and testr have replaced nose, trims all references
and removes nose from test-requires.

Change-Id: I0aae8fe2c09c5b25741226555838dc330d5c4d91
Merge "Remove all references to nose"
Merge "Enhance testcase for failed resource deletion"