Add a new option '-m master' to automount(8) which adds an additional file to the
set of master files to be processed. (Default: Just /etc/auto_master.)
Add a new rc.conf variable 'autofs_masters' which can take absolute paths and names
of files inside /etc/autofs/.
This is aimed at allowing users to configure autofs mount points via rc.conf rather
than needing to edit /etc/auto_master.