re(4) update

["Sepherosa Ziehau" <sepherosa@xxxxxxxxx>]

Hi all,

Main part of following patch is obtained from FreeBSD:
http://leaf.dragonflybsd.org/~sephe/re.diff

- correct eeprom accessing
- support more 8169 based chips

FreeBSD's re(4) turns off TX moderation by default, but I have seen
netperf's UDP/TCP_STREAM noticable performance degradation in this
way.  So a new per interface sysctl is added to turn on/off TX
moderation on fly:
hw.re0.tx_moderation
It is _on_ by default.

Please test/review it (it is against HEAD)
If no objection comes, I will commit it one week later.

Best Regards,
sephe

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