MEDIUM: mworker: stop the master proxy in the workers

The master proxy which handles the CLI should not be used or shown in
the stats of the workers. This proxy is now disabled after the fork.
diff --git a/src/haproxy.c b/src/haproxy.c
index 4e6d243..81db3e0 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -3058,6 +3058,8 @@
 			struct mworker_proc *child, *it;
 			master = 0;
 
+			mworker_cli_proxy_stop();
+
 			/* free proc struct of other processes  */
 			list_for_each_entry_safe(child, it, &proc_list, list) {
 				/* close the FD of the master side for all