testnode: give time to supervisord to kill sub processes

supervirord when stopping might need several seconds to kill
properly sub processes. So give him some time before killing
more brutaly with killall.

This should solve issue with functional tests are not working
due to apache not starting. Apache when killed to brutally
let unclosed semaphore, and after some time, we have too many
semaphore to start new apache, making functional tests failing.

erp5/util/testnode/ProcessManager.py

@@ -228,7 +228,22 @@ class ProcessManager(object):
           logger.debug('ProcessManager killPreviousRun,'
                        ' going to kill supervisor with pid %r', pid)
           os.kill(pid, signal.SIGTERM)
+          # Give at most two minutes to supervisord to stop everything
+          i = 0
+          while True:
+            try:
+              psutil.Process(pid)
+              logger.debug('ProcessManager killPreviousRun, supervisor still there with pid %r', pid)
+            except psutil.NoSuchProcess:
+              break
+            else:
+              time.sleep(1)
+              i += 1
+              if i > 120:
+                logger.debug('ProcessManager killPreviousRun, supervisor still there after two minutes %r', pid)
+                break
       except Exception:
+        raise
         logger.exception(
           'ProcessManager killPreviousRun, exception when killing supervisor')
     self.process_pid_set.clear()