Make max_tries from control_plane_test_stop.sh configurable

In some setups, the max_tries hardcoded value of 60 (which corresponds to
5 min) is not enough to finish the test.

Change-Id: Ifb0cfba433d09cb1c9b752e5f276edbebf0aeb0a

defaults/main.yml

@@ -201,6 +201,8 @@ control_plane_check: false
 tu_ctl_plane_max_successive_failure: 2
 # Max number of total failure (euristic for update run)
 tu_ctl_plane_max_failure: 6
+# Max retries waiting for the control plane test to stop
+control_plane_test_stop_max_retries: 60  # 5 seconds x num_tries = 5 min by default
 
 # enable web load test
 fip_http_check: false

templates/control_plane_test_stop.sh.j2

@@ -22,7 +22,7 @@ result_file={{ working_dir }}/control-plane-test-${PID}.log
 
 kill "${PID}"
 
-max_tries=60                     # 5min
+max_tries={{ control_plane_test_stop_max_retries }}
 current_try=0
 until [ -e ${done_file} ]; do
     if [ $current_try -le $max_tries ]; then