Cleanup interface constant

Change-Id: Ief110d6db88889e5c01c43b5d410330114c65ad9
diff --git a/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java b/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
index 03b4f40..ac9b291 100644
--- a/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
+++ b/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
@@ -220,7 +220,10 @@
     private static int numOfHandlerScheduled = 0;
 
     private KryoNamespace.Builder kryoBuilder = null;
-
+    /**
+     * Segment Routing App ID.
+     */
+    public static final String SR_APP_ID = "org.onosproject.segmentrouting";
     /**
      * The starting value of per-subnet VLAN ID assignment.
      */