Ensure nullable=False for netid in packetfilters table

From the initial commit of NEC plugin, network_id of packetfilters
table is nullable=False, but in folsom_initial db migration script
nullable is set to True. This commit ensure nullable=False for
network_id in packetfilters table in any migration revision.

Change-Id: I2f1ebc16b57d8d6548255079c66d326d97fda5b6
Closes-Bug: #1229508

neutron/db/migration/alembic_migrations/versions/2528ceb28230_nec_pf_netid_fix.py

@@ -0,0 +1,61 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+#
+# Copyright 2013 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.
+#
+
+"""NEC PacketFilter network_id nullable fix
+
+Revision ID: 2528ceb28230
+Revises: 1064e98b7917
+Create Date: 2013-09-24 12:07:43.124256
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '2528ceb28230'
+down_revision = '1064e98b7917'
+
+# Change to ['*'] if this migration applies to all plugins
+
+migration_for_plugins = [
+    'neutron.plugins.nec.nec_plugin.NECPluginV2'
+]
+
+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
+
+    op.alter_column('packetfilters', 'network_id',
+                    existing_type=sa.String(length=36),
+                    nullable=False)
+
+
+def downgrade(active_plugins=None, options=None):
+    if not migration.should_run(active_plugins, migration_for_plugins):
+        return
+
+    # NOTE(amotoki): There is a bug that nullable of network_id is
+    # set to True by mistake in folsom_initial (bug 1229508).
+    # To make sure nullable=False in any revision, nullable is set
+    # to False in both upgrade and downgrade.
+    op.alter_column('packetfilters', 'network_id',
+                    existing_type=sa.String(length=36),
+                    nullable=False)

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

@@ -321,7 +321,7 @@ def upgrade_nec():
         'packetfilters',
         sa.Column('tenant_id', sa.String(length=255), nullable=True),
         sa.Column('id', sa.String(length=36), nullable=False),
-        sa.Column('network_id', sa.String(length=36), nullable=True),
+        sa.Column('network_id', sa.String(length=36), nullable=False),
         sa.Column('priority', sa.Integer(), nullable=False),
         sa.Column('action', sa.String(16), nullable=False),
         sa.Column('in_port', sa.String(36), nullable=False),