New em driver

[Jack Vogel]

After a conference call today, it was decided that a merge of
my Intel driver base and the STABLE code would take place.

This code undoes the INTR_FAST/taskqueue approach for right
now. Work will continue to get that to work, but the hope is that
this driver will be more stable for the 6.2 release.

I encourage everyone that has been having issues to pull the
new driver and give us feedback. A few select testers so far
have seen stable performance.

Cheers,

Jack