Fix an action of t3-troubleshot-mcast command when no sink for a multicast route

- Prints a message saying that there is no sink to trace

Change-Id: Ib113170c2c2a73e8a71b3819d2b814113adf357d
(cherry picked from commit fbd65dbd60d20878a3576de1fbd68d4bdee6f26c)
diff --git a/app/src/main/java/org/onosproject/t3/cli/TroubleshootMcastCommand.java b/app/src/main/java/org/onosproject/t3/cli/TroubleshootMcastCommand.java
index d3fefec..325691e 100644
--- a/app/src/main/java/org/onosproject/t3/cli/TroubleshootMcastCommand.java
+++ b/app/src/main/java/org/onosproject/t3/cli/TroubleshootMcastCommand.java
@@ -81,7 +81,7 @@
                         print("Failure: %s", trace.resultMessage());
                         failedTraces.add(trace);
                     } else {
-                        print("Success");
+                        print(trace.resultMessage());
                     }
                 }
             } else {