This basically adds the "rtable %d" keyword to "listen on", "server",
"servers" keywords, to specify which routing table to use.
OK henning@ claudio@ sthen@
manpage reviewed by jmc@

but this might increase portability since some other systems do not
grok negative tv_usec well. ok henning@

time, and make ntpd use that to send the next uery to an ntp peer and the
like. this has the advantage that changes to the clock do not interfere
with the intervals. for example, when we start on machines without an
RTC and the initial settime (-s) kicks in, intervals were strange.
idea from amandal@entrisphere.com, this implementation by me
tested ckuethe, phessler, mbalmer, ok mbalmer

overcompensating. From DragonFly, uses recent adjtime(2) changes,
so you'll need a recent kernel. ok henning@

* Respond to the query with a reasonable received time (which
will help clients get better accuracy).
* Consolidate the server response code in preparation for a
completely 'proper' response to the client.
tips and ok from henning@

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

ok henning@