Allocate pseudo tty for ssh

Change-Id: I43e977ce5099b9d593e3e36bd6f2a0f540b54419
diff --git a/tools/test/bin/onos-service b/tools/test/bin/onos-service
index d5fabe5..d7b0a08 100755
--- a/tools/test/bin/onos-service
+++ b/tools/test/bin/onos-service
@@ -40,5 +40,5 @@
 
 # Execute the remote commands
 for node in $nodes; do
-    ssh $ONOS_USER@${node} "sudo service onos ${2:-status}"
+    ssh -t $ONOS_USER@${node} "sudo service onos ${2:-status}"
 done