Route is not populated correctly when next hop moves

When the next hop moves from [1A,1B] to [1A],
there should be a route on 1B pointing to 1A via spines

Change-Id: I817414fb4e9edf29357fdb5e55675537ff5f0cac
(cherry picked from commit 53eae194a8b66287855483359309597e8df2efa9)
diff --git a/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java b/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
index 7804e68..494b9ec 100644
--- a/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
+++ b/app/src/test/java/org/onosproject/segmentrouting/RouteHandlerTest.java
@@ -414,7 +414,8 @@
         HostEvent he = new HostEvent(HostEvent.Type.HOST_MOVED, H3S, H3D);
         routeHandler.processHostMovedEvent(he);
 
-        assertEquals(1, ROUTING_TABLE.size());
+        // We do not remove the route on CP2. Instead, we let the subnet population overrides it
+        assertEquals(2, ROUTING_TABLE.size());
         MockRoutingTableValue rtv1 = ROUTING_TABLE.get(new MockRoutingTableKey(CP1.deviceId(), P1));
         assertEquals(M3, rtv1.macAddress);
         assertEquals(V3, rtv1.vlanId);