Switch to online db migration

Since Neutron switched to online db migrations, it makes sense
to switch this one as well.

Change-Id: I80408a778c52ba5cc4f4aaba69ec83ca965d027f

networking_l2gw/db/migration/alembic_migrations/versions/HEAD

@@ -1 +0,0 @@
-42438454c556

networking_l2gw/db/migration/alembic_migrations/versions/HEADS

@@ -0,0 +1,2 @@
+60019185aa99
+79919185aa99

networking_l2gw/db/migration/alembic_migrations/versions/kilo_release.py

@@ -0,0 +1,29 @@
+#    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.
+#
+
+"""kilo
+
+Revision ID: kilo
+Revises: 42438454c556
+Create Date: 2015-04-16 00:00:00.000000
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'kilo'
+down_revision = '42438454c556'
+
+
+def upgrade():
+    """A no-op migration for marking the Kilo release."""
+    pass

networking_l2gw/db/migration/alembic_migrations/versions/liberty/contract/79919185aa99_initial_contract.py

@@ -0,0 +1,32 @@
+#    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.
+#
+
+"""Initial no-op Liberty contract rule.
+
+Revision ID: 79919185aa99
+Revises: kilo
+Create Date: 2015-07-16 00:00:00.000000
+
+"""
+
+from neutron.db.migration import cli
+
+
+# revision identifiers, used by Alembic.
+revision = '79919185aa99'
+down_revision = 'kilo'
+branch_labels = (cli.CONTRACT_BRANCH,)
+
+
+def upgrade():
+    pass

networking_l2gw/db/migration/alembic_migrations/versions/liberty/expand/60019185aa99_initial_expand.py

@@ -0,0 +1,32 @@
+#    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.
+#
+
+"""Initial no-op Liberty expand rule.
+
+Revision ID: 60019185aa99
+Revises: kilo
+Create Date: 2015-07-16 00:00:00.000000
+
+"""
+
+from neutron.db.migration import cli
+
+
+# revision identifiers, used by Alembic.
+revision = '60019185aa99'
+down_revision = 'kilo'
+branch_labels = (cli.EXPAND_BRANCH,)
+
+
+def upgrade():
+    pass