Add user-supplied arguments in log_handler

Sync from Oslo, change-id: I91289cc4a60f5dab89bca852e6f52b4b83831e47

When using PublishErrorsHandler, it will missing user-supplied
arguments. For example, do LOG.info("blabla %s", "foo"), the
payload only contains "blabla %s", but we expect it like "blabla foo".

Change-Id: I9e5515da31a04b82d49e406bc6b246f940fb73fc

neutron/openstack/common/log_handler.py

@@ -11,6 +11,7 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
+
 import logging
 
 from oslo.config import cfg
@@ -26,4 +27,4 @@ class PublishErrorsHandler(logging.Handler):
         notifier.api.notify(None, 'error.publisher',
                             'error_notification',
                             notifier.api.ERROR,
-                            dict(error=record.msg))
+                            dict(error=record.getMessage()))