closes-bug:#1392591 1)Enabling instance_manager_test, loabalncer_test, loadbalancer_haproxy_test 2) Adding the Clear() routine for loadbalancer oper db table 3) Creating the temporary files in the test cases in curent directory for permission reason

Change-Id: If857169d9bb1f581d66c860a95de9d7a27259dae
Merge "closes-bug:#1392591 1)Enabling instance_manager_test, loabalncer_test, loadbalancer_haproxy_test 2) Adding the Clear() routine for loadbalancer oper db table 3) Creating the temporary files in the test cases in curent directory for permission reason"