sync Intel nic driver (em/igb) with FreeBSD 9 stable august 14, 2017
Create stable 0.9 branch
Update em(4) and igb(4) based on FreeBSD 9.2 driver
reset props for svn keywords
tag and remove dead code.
sync with freebsd 9 stable.
Update em(4) and igb(4) Intel network drivers. Obtained from: FreeBSD 7-stable
Add intel igb(4), update em(4) part 2 of 3
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