Though the broadcom tool was easy enough to setup and use under Windows,
getting the Intel counterpart to work was an epic fail.  Instead, go after
the registry directly.  There is some semblance of standardization there,
even though no command line tool exists for tweaking these setttings.
Back out the code that set speed/duplex using the broadcom tool since it
is no longer needed.  This will be much better for remote sites and porting
to other hardware in general.  Hopefully other vendors follow suit and use
the same registry settings that Intel and Broadcom do.  Also modified the
interface setup code to delay enabling the interface until after the speed
and duplex settings are poked into the registry so that the driver will pick
them up immediately, w/o requiring a reboot.

Since setting the speed/duplex correctly solves prior issues I saw with
linktest bandwidth tests, back those hacks out.