asking the privileged one to do it. sends back an imsg with the
resulting addresses in a bunch of struct sockaddr_storage in the data
part.
this should fix all remaining issues with dns (non-)availability at
ntpd startup, be it due to named on localhost or something else.
tested by marco@ and Chris Paul <chris.paul@sentinare.com>

SIGHUP, noticed by otto

adjtime() when necessary to keep the local clock in sync
yes, that means ntpd syncs the local clock now.

hook the descriptors into the main poll and such.
we're not doing anything with the reply we recive yet, tho.
mostly hacked on the Frankfurt->Montreal flight, as batteries and those
horrible air canada seats permitted...

for now, one can set the addresses to listen on

default to one IPv4 wildcard and one IPv6 wildcard one.

it is just capable of answering (s)ntp4 requests with the local time
for now.
imsg/buffer and logging framework from bgpd, ntp protocol hackery
with Alexander Guy