Equals review fix for Dist Tunnel Store

Change-Id: Ib893073b991863f53b9e670945a5c916cd957980
diff --git a/incubator/store/src/main/java/org/onosproject/incubator/store/tunnel/impl/DistributedTunnelStore.java b/incubator/store/src/main/java/org/onosproject/incubator/store/tunnel/impl/DistributedTunnelStore.java
index 78c6468..0f48313 100644
--- a/incubator/store/src/main/java/org/onosproject/incubator/store/tunnel/impl/DistributedTunnelStore.java
+++ b/incubator/store/src/main/java/org/onosproject/incubator/store/tunnel/impl/DistributedTunnelStore.java
@@ -148,7 +148,7 @@
     @Override
     public TunnelId createOrUpdateTunnel(Tunnel tunnel) {
         // tunnelIdAsKeyStore.
-        if (tunnel.tunnelId() != null && !"".equals(tunnel.tunnelId())) {
+        if (tunnel.tunnelId() != null && !"".equals(tunnel.tunnelId().toString())) {
             Tunnel old = tunnelIdAsKeyStore.get(tunnel.tunnelId());
             if (old == null) {
                 log.info("This tunnel[" + tunnel.tunnelId() + "] is not available.");