XXX shares database file with IPv4 one (0.0.127.in-addr.arpa)

Submitted by: kevlo@

DAD before the actual rtsol(8) run happens later.  and since it will rtsol,
it is going to be up in any case.

XXX both "dhcp" and "rtsol" has keyword *down* at the end.  is it okay?

sleep for net.inet6.ip6.dad_count seconds to ensure that IPv6 DAD is completed.
TODO: rtsold (rc.conf line), manpage

to do this,
1. in sysctl.conf, add these lines:
net.inet6.ip6.forwarding=0
net.inet6.ip6.accept_rtadv=1
2. in hostname.foo, add
rtsol
specifying two or more interfaces with "rtsol" may result in strange
behavior - ipv6 spec does not permit multi-interface node to be autoconfig'ed.

- multiple entries support (read: aliases)
- inet6 support
- support for comments (#)
(look for hostname.if(5) commit for syntax details)

rcsid police on usr.sbin/rtadvd.
add sample config into etc/rtadvd.conf.
add files into distrib/sets/list.

MUST make lo0 up before any IPv6 operations.
it will be considered a pilot error if you don't.
(I prefer to have lo0 initialized automatically)

includes some works from todd@ and millert@
verified by todd@ and millert@

/usr/libexec/locate.updatedb does run as nobody the redirection is
done as root so the resulting file is owned by root.
sync log file owner/mode with what is is newsyslog.conf