Remove "overcloud-swift-rings" container during overcloud deletion

Trying to re-run `openstack overcloud deploy` now fails with
"A container with the name overcloud-swift-rings already exists."
It happens because Ьistral doesn't remove the container during the
deletion process.

This patch adds the removal of the container to the corresponding
action.

Change-Id: I3f62fc61758cb817c45df8e67ed3639934edd038
Closes-bug: #1738437

tripleo_common/actions/plan.py

@@ -119,6 +119,8 @@ class DeletePlanAction(base.TripleOAction):
         try:
             swift = self.get_object_client(context)
             swiftutils.delete_container(swift, self.container)
+            swiftutils.delete_container(swift,
+                                        "%s-swift-rings" % self.container)
         except swiftexceptions.ClientException as ce:
             LOG.exception("Swift error deleting plan.")
             error_text = ce.msg

tripleo_common/tests/actions/test_plan.py

@@ -201,6 +201,7 @@ class DeletePlanActionTest(base.TestCase):
         swift = mock.MagicMock()
         swift.get_account.return_value = ({}, [
             {'name': self.container_name},
+            {'name': "%s-swift-rings" % self.container_name},
             {'name': 'test'},
         ])
         swift.get_container.return_value = (
@@ -232,7 +233,39 @@ class DeletePlanActionTest(base.TestCase):
         swift.delete_object.assert_has_calls(
             mock_calls, any_order=True)
 
-        swift.delete_container.assert_called_with(self.container_name)
+        mock_calls = [
+            mock.call(self.container_name),
+            mock.call("%s-swift-rings" % self.container_name)
+        ]
+        self.assertEqual(2, swift.delete_container.call_count)
+        swift.delete_container.assert_has_calls(mock_calls)
+
+    @mock.patch('tripleo_common.actions.base.TripleOAction.get_object_client')
+    @mock.patch(
+        'tripleo_common.actions.base.TripleOAction.get_orchestration_client')
+    def test_run_no_containers(
+            self, get_orchestration_client, get_obj_client_mock):
+
+        # setup swift
+        swift = mock.MagicMock()
+        # There are no swift containers because they were either accidentally
+        # removed or not created.
+        swift.get_account.return_value = ({}, [])
+
+        get_obj_client_mock.return_value = swift
+
+        # setup heat
+        heat = mock.MagicMock()
+        heat.stacks.get = mock.Mock(
+            side_effect=heatexceptions.HTTPNotFound)
+        get_orchestration_client.return_value = heat
+
+        action = plan.DeletePlanAction(self.container_name)
+        action.run(self.ctx)
+
+        # The operation was successfully finished and we didn't try to remove
+        # nonexistent containers.
+        self.assertEqual(0, swift.delete_container.call_count)
 
 
 class ListRolesActionTest(base.TestCase):

tripleo_common/utils/swift.py

@@ -50,8 +50,13 @@ def empty_container(swiftclient, name):
 
 
 def delete_container(swiftclient, name):
-    empty_container(swiftclient, name)
-    swiftclient.delete_container(name)
+    try:
+        empty_container(swiftclient, name)
+        swiftclient.delete_container(name)
+    except ValueError as e:
+        # ValueError is raised when we can't find the container, which means
+        # that it's already deleted.
+        LOG.info(e.message)
 
 
 def download_container(swiftclient, container, dest):