MFC r317854:

  When editing a mode page on a tape drive, do not clear the device
  specific parameter.

  Tape drives include write protect (WP), Buffered Mode and Speed
  settings in the device-specific parameter.  Clearing this
  parameter on a mode select can have the effect of turning off
  write protect or buffered mode, or changing the speed setting of
  the tape drive.

  Disks report DPO/FUA support via the device specific parameter
  for MODE SENSE, but the bit is reserved for MODE SELECT.  So we
  clear this for disks (and other non-tape devices) to avoid
  potential errors from the target device.

  sbin/camcontrol/modeedit.c:
  	Clear the device-specific parameter in the mode page
  	header if we're not operating on a tape drive.

Sponsored by:	Spectra Logic

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