Closes PR 5625
ok ajacoutot@, jakob@

- spamd(8) configuration now lives in /etc/mail, too
- sort some items that were out of order
ok jmc@.  no objections millert@

yes, I know, afs on vax, who would want this?

ok djm@ millert@

ok miod@ jasper@

and now that the behaviour of -g has changed to be more in line
with posix, we get group ID by default anyway;
kick started by PR 5784 from Jacek Masiulaniec;
discussed with otto and sobrado;
ok deraadt millert

and not available at that time. Rewrite the hostname.if permission check
to use only /bin/ls and the shell. Requested by deraadt.
ok todd, "Twisted." deraadt

ok krw@

exists. From wcmaier@.
Check target of symbolic links to avoid noise at boot and in
seucrity output where you have several interfaces symlinked to one
config file.
"If you think this is the right thing to do" deraadt@

available on amd64.

contents of /etc/services so as to avoid randomly allocating
source ports that correspond to well-known services. Auto-filling
of the baddynamic tables is performed before reading sysctl.conf,
so it is still possible to add or subtract ports, or override the
autofilling entirely there.
Note that this requires a new kernel and /sbin/sysctl.
feedback markus@ ok markus@ deraadt@ millert@

"Special purpose devices" section, since a hardware driver which uses
video(4) also could be none-USB as long it uses the V4L2 API.
OK todd@

"just get it in" deraadt

get it in, deraadt@

help (a lot...) and ok todd.

ok deraadt@, marco@

through an optionnal /etc/sysmerge.ignore file
requested by many
man page tweak from jmc@
/etc/changelist addition suggested by sthen@
ok sthen@ jdixon@ jmc@ naddy@

ok oga@

please commit from deraadt@