Remove bridges and associated flow rules when removing k8s nodes

Change-Id: Iab54503a4bb75874f69e8e1623bb11c66cad9eee
diff --git a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/Constants.java b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/Constants.java
index 2c60c79..4768043 100644
--- a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/Constants.java
+++ b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/Constants.java
@@ -104,6 +104,7 @@
     public static final int PRIORITY_FORCED_ACL_RULE = 50000;
     public static final int PRIORITY_ICMP_PROBE_RULE = 50000;
     public static final int PRIORITY_NODE_PORT_RULE = 42000;
+    public static final int PRIORITY_ROUTER_RULE = 10000;
     public static final int PRIORITY_DEFAULT_RULE = 0;
 
     // flow table index