Revert "ovs-agent: Ensure integration bridge is created"

This reverts commit e5cdad90f9.

TripleO's multi-node testing shows that this patch caused a failure to receive
tunnel updates, leading to the first node up to have no agent ports, the second
to have one agent port, the third to have 2 agent ports, etc. Needless to say,
this doesn't work all that well :)

Change-Id: Ie90dd4d113a404948dd5debad48065b7db48faa5
Closes-Bug: #1292105

neutron/plugins/openvswitch/agent/ovs_neutron_agent.py

@@ -179,11 +179,11 @@ class OVSNeutronAgent(rpc_compat.RpcCallback,
         self.int_br_device_count = 0
 
         self.int_br = ovs_lib.OVSBridge(integ_br, self.root_helper)
-        self.setup_integration_br()
         self.int_br.set_secure_mode()
         # Stores port update notifications for processing in main rpc loop
         self.updated_ports = set()
         self.setup_rpc()
+        self.setup_integration_br()
         self.bridge_mappings = bridge_mappings
         self.setup_physical_bridges(self.bridge_mappings)
         self.local_vlan_map = {}
@@ -733,12 +733,6 @@ class OVSNeutronAgent(rpc_compat.RpcCallback,
         :param bridge_name: the name of the integration bridge.
         :returns: the integration bridge
         '''
-        # Ensure the integration bridge is created.
-        # ovs_lib.OVSBridge.create() will run
-        #   ovs-vsctl -- --may-exist add-br BRIDGE_NAME
-        # which does nothing if bridge already exists.
-        self.int_br.create()
-
         self.int_br.delete_port(cfg.CONF.OVS.int_peer_patch_port)
         self.int_br.remove_all_flows()
         # switch all traffic using L2 learning

neutron/tests/unit/openvswitch/test_ovs_neutron_agent.py

@@ -118,8 +118,6 @@ class TestOvsNeutronAgent(base.BaseTestCase):
             mock.patch('neutron.plugins.openvswitch.agent.ovs_neutron_agent.'
                        'OVSNeutronAgent.setup_ancillary_bridges',
                        return_value=[]),
-            mock.patch('neutron.agent.linux.ovs_lib.OVSBridge.'
-                       'create'),
             mock.patch('neutron.agent.linux.ovs_lib.OVSBridge.'
                        'set_secure_mode'),
             mock.patch('neutron.agent.linux.ovs_lib.OVSBridge.'

neutron/tests/unit/openvswitch/test_ovs_tunnel.py

@@ -107,14 +107,13 @@ class TunnelTest(base.BaseTestCase):
         self.mock_int_bridge = self.ovs_bridges[self.INT_BRIDGE]
         self.mock_int_bridge.get_local_port_mac.return_value = '000000000001'
         self.mock_int_bridge_expected = [
-            mock.call.create(),
+            mock.call.set_secure_mode(),
+            mock.call.get_local_port_mac(),
             mock.call.delete_port('patch-tun'),
             mock.call.remove_all_flows(),
             mock.call.add_flow(priority=1, actions='normal'),
             mock.call.add_flow(priority=0, table=constants.CANARY_TABLE,
-                               actions='drop'),
-            mock.call.set_secure_mode(),
-            mock.call.get_local_port_mac()
+                               actions='drop')
         ]
 
         self.mock_map_tun_bridge = self.ovs_bridges[self.MAP_TUN_BRIDGE]