Fast reboot support in ixgbe
This is a resubmission of Joerg Goltermann's patch from 2010 which adds quiesce(9E) support into ixgbe. I've tested this out on an Intel X520-DA2: 50 fast reboots in a row with no trouble.
The implementation itself is essentially a close copy of igb_quiesce.
cstyle and lint clean.
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