Rework source layout in preparation for modular sudo.

doc/sample.syslog.conf

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+# This is a sample syslog.conf fragment for use with Sudo.
+#
+# Sudo logs to local2 by default, but this is changable via the
+# --with-logfac configure option.  To see what syslog facility
+# a sudo binary uses, run `sudo -V' as *root*.  You may have
+# to check /usr/include/syslog.h to map the facility number to
+# a name.
+#
+# NOTES:
+#	The whitespace in the following line is made up of <TAB>
+#       characters, *not* spaces.  You cannot just cut and paste!
+#
+#	If you edit syslog.conf you need to send syslogd a HUP signal.
+#	Ie: kill -HUP process_id
+#
+#	Syslogd will not create new log files for you, you must first
+#	create the file before syslogd will log to it.  Eg.
+#	'touch /var/log/sudo'
+
+# This logs successful and failed sudo attempts to the file /var/log/sudo
+local2.debug					/var/log/sudo
+
+# To log to a remote machine, use something like the following,
+# where "loghost" is the name of the remote machine.
+local2.debug					@loghost