Enables quota extension on BigSwitch plugin

Adds quotas to supported extensions in
BigSwitch plugin and adds db migration script
to create quota tables for BigSwitch plugin.

Closes-Bug: #1266334
Change-Id: I255b318fde792ef59fe2cf456df4be87135c65cd

neutron/db/migration/alembic_migrations/versions/ed93525fd003_bigswitch_quota.py

@@ -0,0 +1,64 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+#
+# Copyright 2014 OpenStack Foundation
+#
+#    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.
+#
+
+"""bigswitch_quota
+
+Revision ID: ed93525fd003
+Revises: 50e86cb2637a
+Create Date: 2014-01-05 10:59:19.860397
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'ed93525fd003'
+down_revision = '50e86cb2637a'
+
+# Change to ['*'] if this migration applies to all plugins
+
+migration_for_plugins = [
+    'neutron.plugins.bigswitch.plugin.NeutronRestProxyV2'
+]
+
+from alembic import op
+import sqlalchemy as sa
+
+from neutron.db import migration
+
+
+def upgrade(active_plugins=None, options=None):
+    if not migration.should_run(active_plugins, migration_for_plugins):
+        return
+
+    ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        'quotas',
+        sa.Column('id', sa.String(length=36), nullable=False),
+        sa.Column('tenant_id', sa.String(length=255), nullable=True),
+        sa.Column('resource', sa.String(length=255), nullable=True),
+        sa.Column('limit', sa.Integer(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    ### end Alembic commands ###
+
+
+def downgrade(active_plugins=None, options=None):
+    if not migration.should_run(active_plugins, migration_for_plugins):
+        return
+
+    ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('quotas')
+    ### end Alembic commands ###

neutron/plugins/bigswitch/plugin.py

@@ -430,7 +430,7 @@ class NeutronRestProxyV2(db_base_plugin_v2.NeutronDbPluginV2,
                          agentschedulers_db.DhcpAgentSchedulerDbMixin):
 
     supported_extension_aliases = ["external-net", "router", "binding",
-                                   "router_rules", "extra_dhcp_opt",
+                                   "router_rules", "extra_dhcp_opt", "quotas",
                                    "dhcp_agent_scheduler", "agent"]
 
     def __init__(self, server_timeout=None):