Implement support to report error,warning logs after every test case run.

Change-Id: Id5710e9ee3497b4bc1030d7fa69c182d2e1348c6
diff --git a/src/test/dhcprelay/dhcprelayTest.py b/src/test/dhcprelay/dhcprelayTest.py
index dee0aa4..ea0ff47 100644
--- a/src/test/dhcprelay/dhcprelayTest.py
+++ b/src/test/dhcprelay/dhcprelayTest.py
@@ -24,12 +24,13 @@
 from OnosCtrl import OnosCtrl, get_mac
 from OltConfig import OltConfig
 from CordTestServer import cord_test_onos_restart
+from CordLogger import CordLogger
 from portmaps import g_subscriber_port_map
 import threading, random
 from threading import current_thread
 log.setLevel('INFO')
 
-class dhcprelay_exchange(unittest.TestCase):
+class dhcprelay_exchange(CordLogger):
 
     app = 'org.onosproject.dhcprelay'
     app_dhcp = 'org.onosproject.dhcp'