Intel 1G Tx hangs

[Vijay Singh]

>> Running 20ish guests in KVM with emulated e1000 cards and doing fine.
>>
> lucky you! I've been seeing complete RX failure with multiple emulated
> e1000 in qemu guest, cf kern/168246. It did not seem to have yet
> picked much interest from maintainer...
>
>  - Arnaud
>
>> Got a few physical ones in production as well, no hangs here.

FYI, I updated our 8.2 code base to 8-stable e1k drivers and things
appear to have stabilized.

@jfv, the if_lem.c version did change from 1.0.1 to 1.0.4.

-vijay