Fix swift pollsters that use get_account

this is a followup to I38f9ff2bec0a2a3cb9dfc5c362284e33c12f3127

in swiftclient, head_account and get_account have somewhat different
signatures, specifically order of kwargs. While passing http_conn as
third arg works for head_account, it does not work for get_account.
In order for it to work for both, it must be passed as kwarg.

Change-Id: I5433dc248e3f02c67107466408ed8c9ea8dd16a7

ceilometer/objectstore/swift.py

@@ -93,7 +93,7 @@ class _Base(plugin_base.PollsterBase):
                 yield (t.id, swift_api_method(
                     None,
                     keystone_client.get_auth_token(ksclient),
-                    http_conn))
+                    http_conn=http_conn))
             except ClientException as e:
                 if e.http_status == 404:
                     LOG.warning("Swift tenant id %s not found.", t.id)

ceilometer/tests/unit/objectstore/test_swift.py

@@ -207,7 +207,7 @@ class TestSwiftPollster(testscenarios.testcase.WithScenarios,
         self.assertEqual(expected, mock_connection.call_args_list)
 
         expected = [mock.call(None, self.manager._auth_token,
-                              mock_connection.return_value)
+                              http_conn=mock_connection.return_value)
                     for t in ASSIGNED_TENANTS]
         self.assertEqual(expected, mock_method.call_args_list)