Time-stamp added and renamed heartbeat

Change-Id: I7f38752aa83572bc6b6b93093546e0fdf47763f5
diff --git a/tests/itests/docutests/build_md_test.py b/tests/itests/docutests/build_md_test.py
index d8c888c..f4b43b7 100644
--- a/tests/itests/docutests/build_md_test.py
+++ b/tests/itests/docutests/build_md_test.py
@@ -441,7 +441,7 @@
 
             # Verify kafka client is receiving the messages
             print "Verify kafka client is receiving the heartbeat messages ..."
-            expected_pattern = ['heartbeat.voltha', 'heartbeat']
+            expected_pattern = ['voltha.heartbeat', 'heartbeat']
             cmd = command_defs['kafka_client_run_10_secs']
             kafka_client_output = run_long_running_command_with_timeout(cmd,
                                                                         20)