Make service and monitor permissions checks optional

MaxScale shouldn't require the service and monitor user checks. It makes
sense to disable the checks to speed up the startup process when the user
knows that the permissions are OK.

server/core/monitor.c

@@ -543,6 +543,11 @@ bool check_monitor_permissions(MONITOR* monitor, const char* query)
         return false;
     }
 
+    if (config_get_global_options()->skip_permission_checks)
+    {
+        return true;
+    }
+
     char *user = monitor->user;
     char *dpasswd = decryptPassword(monitor->password);
     GATEWAY_CONF* cnf = config_get_global_options();