[ONOS-5607] Revise LISP ctrl impl class to track msgs and routers

Change-Id: I4a51a8ef9162e3feee543f40fa92a0435186d1c9
diff --git a/protocols/lisp/api/src/test/java/org/onosproject/lisp/ctl/LispControllerAdapter.java b/protocols/lisp/api/src/test/java/org/onosproject/lisp/ctl/LispControllerAdapter.java
index c096131..aeebeeb 100644
--- a/protocols/lisp/api/src/test/java/org/onosproject/lisp/ctl/LispControllerAdapter.java
+++ b/protocols/lisp/api/src/test/java/org/onosproject/lisp/ctl/LispControllerAdapter.java
@@ -25,6 +25,11 @@
     }
 
     @Override
+    public Iterable<LispRouter> getSubscribedRouters() {
+        return null;
+    }
+
+    @Override
     public LispRouter getRouter(LispRouterId routerId) {
         return null;
     }