Add two commented out syslog.conf entries, one to demonstrate the use of

Add two commented out syslog.conf entries, one to demonstrate the use of
an all.log for logging all messages, and one to demonstrate use of loghosts.
Also, a matching entry in newsyslog.conf for all.log.

Per request of Garrett Wollman, also modified the maillog entry to use the
@T newsyslog time specification mechanism.  Because newsyslog doesn't
support the mod date specification machanism, couldn't change other
entries that required more than one execution a month, but less than once
a day.

Approved by:	jkh
Reviewed by:	freebsd-security