No maxctrl equivalent for maxadmin "reload dbusers"

There's no equivalent for the maxadmin "reload dbusers" command in maxctrl.

The command is of use though if a user was added, or its password changed, as automatic user data reloading may not happen if there has been another reload event within user_refresh_time already.

So having a command to trigger/force user data reload from the outside still seems to make sense.