T3: Adding a test all multicast routes command

Change-Id: I8fe144cc8f5c4c592f2ac78bdc9d0417c0ab842d
(cherry picked from commit d3130e8efa30c8d5ff3d1baa890e94ba3fab04d9)
diff --git a/apps/t3/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/apps/t3/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index 658b912..48df042 100644
--- a/apps/t3/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/apps/t3/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -34,6 +34,9 @@
                 <entry key="-et" value-ref="ethTypeCompleter"/>
             </optional-completers>
         </command>
+        <command>
+            <action class="org.onosproject.t3.cli.TroubleshootMcastCommand"/>
+        </command>
     </command-bundle>
 
     <bean id="hostIdCompleter" class="org.onosproject.cli.net.HostIdCompleter"/>