Add rules column to instance_group_policy table.

This adds the rules column to instance_group_policy table.

The ''Text'' column "rules" which is a dict, it can be
applied to the policy, and represents the rules for
specific policy.

Related to blueprint complex-anti-affinity-policies

Change-Id: I61ffb5ddb2d808bfef4e60088f4524bd98e0474e

nova/db/sqlalchemy/api_migrations/migrate_repo/versions/060_instance_group_policy_add_rules.py

@@ -0,0 +1,26 @@
+#    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 sqlalchemy import Column
+from sqlalchemy import MetaData
+from sqlalchemy import Table
+from sqlalchemy import Text
+
+
+def upgrade(migrate_engine):
+    meta = MetaData()
+    meta.bind = migrate_engine
+
+    policies = Table('instance_group_policy', meta, autoload=True)
+
+    if not hasattr(policies.c, 'rules'):
+        policies.create_column(Column('rules', Text))

nova/db/sqlalchemy/api_models.py

@@ -417,6 +417,7 @@ class InstanceGroupPolicy(API_BASE):
     policy = Column(String(255))
     group_id = Column(Integer, ForeignKey('instance_groups.id'),
                       nullable=False)
+    rules = Column(Text)
 
 
 class InstanceGroup(API_BASE):

nova/tests/functional/db/api/test_migrations.py

@@ -713,6 +713,9 @@ class NovaAPIMigrationsWalk(test_migrations.WalkVersionsMixin):
         self.assertEqual(1, len(result))
         self.assertEqual(0, result[0]['generation'])
 
+    def _check_060(self, engine, data):
+        self.assertColumnExists(engine, 'instance_group_policy', 'rules')
+
 
 class TestNovaAPIMigrationsWalkSQLite(NovaAPIMigrationsWalk,
                                       test_base.DbTestCase,