[VOL-1787] :
This commit sets up a unit-test framework for openolt
agent based on gtest, gmock and c-mock utilities.
A sample unit-test case to test EnableOlt success case is also
added. More test cases will be added in future commit.

Change-Id: If020be489a04d97df5fcbc15e9207deeee2fcfac
diff --git a/agent/src/utils.cc b/agent/src/utils.cc
index d748ce3..9fde90e 100644
--- a/agent/src/utils.cc
+++ b/agent/src/utils.cc
@@ -15,6 +15,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <string.h>
 #include "utils.h"
 
 std::string serial_number_to_str(bcmolt_serial_number* serial_number) {