ONOS-4660 Additional GATEWAY type node bootstrap

- Add uplink interface to the router bridge
- Set separate controller for the router bridge
- Use OVSDB provider to check the ports list and keep OVSDB session

Limitation:
OVSDB provider does not provide port or bridge updates, that is,
any changes on the router bridge may not be detected by ONOS

Change-Id: I1f17f4fb2c050afdbda1e5ffc06f6485903d3d90
diff --git a/apps/openstacknode/src/main/java/org/onosproject/openstacknode/Constants.java b/apps/openstacknode/src/main/java/org/onosproject/openstacknode/Constants.java
index b4c3f04..b4074f7 100644
--- a/apps/openstacknode/src/main/java/org/onosproject/openstacknode/Constants.java
+++ b/apps/openstacknode/src/main/java/org/onosproject/openstacknode/Constants.java
@@ -28,4 +28,8 @@
     public static final String DEFAULT_TUNNEL = "vxlan";
     public static final String PATCH_INTG_BRIDGE = "patch-intg";
     public static final String PATCH_ROUT_BRIDGE = "patch-rout";
+
+    public static final int DEFAULT_OVSDB_PORT = 6640;
+    public static final int DEFAULT_OFPORT = 6653;
+    public static final String DEFAULT_OF_PROTO = "tcp";
 }
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