Move vmware_nsx/neutron/plugins/vmware to vmware_nsx

This is part of new vmware_nsx directory structure proposed in
https://goo.gl/GdWXyH.

Change-Id: I60d6ef62eb724df71dfda90137e00f107e220971

vmware_nsx/db/distributedrouter.py

@@ -0,0 +1,28 @@
+# Copyright 2013 VMware, Inc.  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 neutron.extensions import dvr as dist_rtr
+from vmware_nsx.db import nsxrouter
+
+
+class DistributedRouter_mixin(nsxrouter.NsxRouterMixin):
+    """Mixin class to enable distributed router support."""
+
+    nsx_attributes = (
+        nsxrouter.NsxRouterMixin.nsx_attributes + [{
+            'name': dist_rtr.DISTRIBUTED,
+            'default': False
+        }])