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/include/proto/cli.h b/include/proto/cli.h
index 74052f7..c41c8bf 100644
--- a/include/proto/cli.h
+++ b/include/proto/cli.h
@@ -28,9 +28,12 @@
 
 int cli_has_level(struct appctx *appctx, int level);
 
+/* mworker proxy functions */
+
 int mworker_cli_proxy_create();
 int mworker_cli_proxy_new_listener(char *line);
 int mworker_cli_sockpair_new(struct mworker_proc *mworker_proc, int proc);
+void mworker_cli_proxy_stop();
 
 /* proxy mode cli functions */