[VOL-2569] :

- Adapt openolt agent to use openolt-test docker container for
  building and running unit tests
- Fix README.md
- Release version 2.1.3

Change-Id: Ie084fde3c312d98b263d6d41587adbdefbea8c29
diff --git a/agent/test/inc/bal_mocker.h b/agent/test/inc/bal_mocker.h
index 50b981d..f60c581 100644
--- a/agent/test/inc/bal_mocker.h
+++ b/agent/test/inc/bal_mocker.h
@@ -15,7 +15,7 @@
  */
 #ifndef __BAL_MOCKER_H__
 #define __BAL_MOCKER_H__
-#include <cmock.h>
+#include <cmock/cmock.h>
 #include <gmock-global/gmock-global.h>
 #include <cstdlib>
 #include <grpc++/grpc++.h>