- Add 99% of a callout based watchdog. The remaining 1% is waiting

- Add 99% of a callout based watchdog.  The remaining 1% is waiting
  for pci_cfg_restore() to be exported.  It was tested using a
  hackily accessed pci_cfg_restore().

- Add ifmedia_removeall() to mxge_detach() in order to stop leaking
  an ifaddr

- Fix a small acounting bug introduced by the locking code shuffle
  which could cause spurious watchdog resets now that we have a
  watchdog.

Sponsored by: Myricom