Adding network driver interface

Definition of network driver interface.  Also removed
the floating_ip attributes of VIP because they are not
needed at this point.  Also renamed net_port_id to just
port_id and subnet_id to network_id just to be a little
bit more generically clear.

Change-Id: Ic82cb2ab25fbba7dc8caa875552f4caeafb0e4af
Implements: bp/network-driver-interface

octavia/db/migration/alembic_migrations/versions/14892634e228_update_vip.py

@@ -0,0 +1,50 @@
+#    Copyright 2014 Rackspace
+#
+#    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.
+
+"""update vip
+
+Revision ID: 14892634e228
+Revises: 13500e2e978d
+Create Date: 2015-01-10 00:53:57.798213
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '14892634e228'
+down_revision = '13500e2e978d'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    with op.batch_alter_table(u'vip') as batch_op:
+        batch_op.alter_column(u'subnet_id', new_column_name=u'network_id',
+                              existing_type=sa.String(36))
+        batch_op.alter_column(u'net_port_id', new_column_name=u'port_id',
+                              existing_type=sa.String(36))
+        batch_op.drop_column(u'floating_ip_id')
+        batch_op.drop_column(u'floating_ip_network_id')
+
+
+def downgrade():
+    with op.batch_alter_table(u'vip') as batch_op:
+        batch_op.add_column(sa.Column(u'floating_ip_network_id',
+                                      sa.String(36), nullable=True))
+        batch_op.add_column(sa.Column(u'floating_ip_id', sa.String(36),
+                                      nullable=True))
+        batch_op.alter_column(u'port_id', new_column_name=u'net_port_id',
+                              existing_type=sa.String(36))
+        batch_op.alter_column(u'network_id', new_column_name=u'subnet_id',
+                              existing_type=sa.String(36))

octavia/db/models.py

@@ -227,10 +227,8 @@ class Vip(base_models.BASE):
                       name="fk_vip_load_balancer_id"),
         nullable=False, primary_key=True)
     ip_address = sa.Column(sa.String(36), nullable=True)
-    net_port_id = sa.Column(sa.String(36), nullable=True)
-    subnet_id = sa.Column(sa.String(36), nullable=True)
-    floating_ip_id = sa.Column(sa.String(36), nullable=True)
-    floating_ip_network_id = sa.Column(sa.String(36), nullable=True)
+    port_id = sa.Column(sa.String(36), nullable=True)
+    network_id = sa.Column(sa.String(36), nullable=True)
     load_balancer = orm.relationship("LoadBalancer", uselist=False,
                                      backref=orm.backref("vip", uselist=False,
                                                          cascade="delete"))