Copy tempest.common.tempest_fixtures in to Neutron

tempest_fixtures is used exclusively in Tempest and Neutron,
therefor I don't think it makes sense to move it in to tempest.lib.
I'd rather copy it in to the Neutron repo.

Change-Id: Ibb52e2cae3f1af1569a04123c43ebc4d125e326d
Related-bug: #1555356

neutron/tests/api/admin/test_agent_management.py

@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.common import tempest_fixtures
+from neutron.tests.tempest.common import tempest_fixtures
 from tempest import test
 
 from neutron.tests.api import base

neutron/tests/api/test_bgp_speaker_extensions.py

@@ -19,7 +19,7 @@ from tempest import test
 import testtools
 
 from neutron.tests.api import base
-from tempest.common import tempest_fixtures as fixtures
+from neutron.tests.tempest.common import tempest_fixtures as fixtures
 
 CONF = config.CONF
 

neutron/tests/tempest/common/tempest_fixtures.py

@@ -0,0 +1,21 @@
+# Copyright 2013 IBM Corp.
+# All Rights Reserved.
+#
+#    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_concurrency.fixture import lockutils
+
+
+class LockFixture(lockutils.LockFixture):
+    def __init__(self, name):
+        super(LockFixture, self).__init__(name, 'tempest-')