`support-files/mysql.server.sh stop` must run as root

The change to run "kill" via "su - $user" seems to require mysql.server to run as root now. We run "mysql.server stop" under an unprivileged user account, and upgrading to mysql 10.1.37 broke our workflow as the "su - $user" bit fails as a non-root user.

Is it possible that this script can skip the "su - $user" step if invoked as a non-root user?