bin/44672: syslogd has no option to specify source port

[martin%NetBSD.org@localhost]

>Number:         44672
>Category:       bin
>Synopsis:       syslogd has no option to specify source port
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 03 13:20:00 +0000 2011
>Originator:     Martin Husemann
>Release:        NetBSD 5.99.47
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-owl.duskware.de 5.99.47 NetBSD 5.99.47 (NIGHT-OWL) #28: 
Sat Feb 26 13:10:46 CET 2011 
martin%night-owl.duskware.de@localhost:/usr/src/sys/arch/amd64/compile/NIGHT-OWL
 amd64
Architecture: x86_64
Machine: amd64
>Description:
There is no option to explicitly specify a fixed port for outgoing syslog
messages to other syslogds (or at least one to specify 514).

Some facist setups require packets to have a certain source port, and there
is no harm for our syslogd to support this.

This PR superseds the mostly incomprehensible PR 44671.

>How-To-Repeat:
Read syslogd(8).
>Fix: