[Ctl] add options to limit number of child process and number of request per process

- new option --max-children allows to define the maximum number of
   child process handling request (default is 5).
 - new option --max-request allows to define the maximum number of
   requests per child before they exit (default is infinite).

authentic/ctl/start.py

@@ -44,6 +44,18 @@ def start(args):
             i += 1
         elif args[i] == '--spawn-cron':
             run_kwargs['spawn_cron'] = True
+        elif args[i] == '--max-children':
+            try:
+                run_kwargs['max_children'] = int(args[i+1])
+            except:
+                raise SystemExit('--max-children needs an integer parameter')
+            i += 1
+        elif args[i] == '--max-requests':
+            try:
+                run_kwargs['handler_connection_limit'] = int(args[i+1])
+            except:
+                raise SystemExit('--max-requests needs an integer parameter')
+
         i += 1
 
     try: