user/ntpfs: implement a basic ntp client

time() will probably end up doing io. That sounded bad at first, but Plan 9
does that too (see /sys/src/libc/9sys/nsec.c), so it's probably fine.

I might need better service management soon. Also, dunno what it should return
before it makes contact with NTP.
I could implement RTC support, but eh. Doesn't feel that necessary.

I'll also need to remember how the hell threading works, so it can talk with
the ntp daemon on another thread.

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