sk(4) update

[Sepherosa Ziehau]

Hi all,

I have updated sk(4), major parts are obtained from OpenBSD:
1) interrupt moderation time is decreased, it boost netperf's
UDP/TCP_RR performance(increase ~20%) and shows no degradation in
TCP/UDP_STREAM performance
2) recognize more cards
3) include a fix for "watchdog timeout"
Please test/review it:
http://leaf.dragonflybsd.org/~sephe/sk.diff
It is against HEAD

I have tested this patch with D-Link DGE-530T and an 88e8001 based card

If no objection comes, I will commit it one week later.

Best Regards,
sephe
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