Add more private symbols to the old namespace package

This patch exposes some private symbols used by the tests in nova and
heat.

Change-Id: Ide40b293c9b9c76aae094950720cead4179ea883
Partial-Bug: #1412812
Partial-Bug: #1412841

oslo/messaging/_executors/base.py

@@ -0,0 +1,17 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from oslo_messaging._executors.base import *  # noqa
+
+# FIXME(dhellmann): Provide a dummy value so the mock in nova's unit
+# test fixture works. See bug #1412841
+POLL_TIMEOUT = 0.1

oslo/messaging/notify/_impl_test.py

@@ -0,0 +1,13 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from oslo_messaging.notify._impl_test import *  # noqa