tests: Remove 'agent' functional tests

The 'os-agents' API was recently removed from nova [1]. Remove the
functional tests, since they will always fail going forward but will
continue to run on older stable branches.

Also Squeeze https://review.opendev.org/#/c/762559/ inside, since those
2 are simultaneously blocking gate

[1] https://review.opendev.org/#/c/749309/

Change-Id: I0bf7d4c0ba2a9d4637db0d209d8d52163d772f12
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

Author: stephenfin

openstackclient/tests/functional/compute/v2/test_agent.py

@@ -65,7 +65,7 @@ def test_capability_show(self):
 
         # confirming if all expected values are present in the result.
         for cap in data:
-            self.assertTrue(cap[0] in capabilities)
+            self.assertIn(cap[0], capabilities)
 
         # checking if proper call was made to get capabilities
         self.capability_mock.get.assert_called_with(