snv_73 goodness

Solaris Nevada b73, when it comes out, is going to have a lot of good NIC stuff in it.

* afe driver (putback yesterday)
* mxfe driver
* rtls on SPARC (including suspend/resume!)
* qfe GLDv3 support

Plus, there are a lot of good networking improvements; a lot of stale code was removed (defunct mobile IPv4 support, detangling NAT, etc.)

There's a bunch of carryover from snv_70-72 too...

I for one, can hardly wait.

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