Improve the delay algorithm used in bgfsck.  From the author:
Improve the delay algorithm used in bgfsck.  From the author:

 shuffles the timing and sleep calls in bgfsck from:

 sleep timer_on io timer_off io io io io io io io
   to
 sleep io io io io io io io timer_on io timer_off

 The original method basically guaranteed that the timed I/O included a
 disk seek every time, which made bgfsck sleep for much longer than
 necessary.

Submitted by:   Dan Nelson
Reviewed by:    kirk

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