WL #2713 Change IM behaviour so, that it only reads and alters one config file only.

Implemented on brian's request.

server-tools/instance-manager/mysqlmanager.cc

@@ -83,7 +83,7 @@ int main(int argc, char *argv[])
       if (set_user(options.user, user_info))
       {
         options.cleanup();
-        return 1;
+        goto err;
       }
   }