stratum is pretty much pointless anyway these days, and we certainly
do not want to send out illegal packets (stratum=0) until synced...

a close-to-reality stratum, a real reference time, and a leap indicator
that will indicate if the local clock isn't synchronized.
This also means that until the server feels it's synchronized, it will
tell the clients it isn't.  This is normal, and correct.
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@

listen on *
listens, well, everywhere.

reported by Peter Hessler.  ok henning@

limit on OPEN_MAX, modeled after bgpd