Several fixes to this driver:

- Overhaul the locking to avoid recursion and add missing locking in a few
  places.
- Don't schedule a task to call vge_start() from contexts that are safe to
  call vge_start() directly.  Just invoke the routine directly instead
  (this is what all of the other NIC drivers I am familiar with do).  Note
  that vge(4) does not use an interrupt filter handler which is the primary
  reason some other drivers use tasks.
- Add a new private timer to drive the watchdog timer instead of using
  if_watchdog and if_timer.
- Fixup detach by calling ether_ifdetach() before stopping the interface.

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