[sudo-workers] Adding a second sysconfdir

[Todd C. Miller]

Another option would be to make _PATH_SUDOERS, _PATH_SUDO_CONF, and
_PATH_SUDO_LOGSRVD_CONF a colon-separated list of path.  For example,
if distconfdir is set this could be "/etc/sudoers:/usr/etc/sudoers".
Then the functions that open the configuration file would simply
choose the first file in the list that exists.

This seems like a more general solution to me.

 - todd