Document the new "-v" option for the gssd daemon.
This is a content change.

MFC after:	2 weeks
 - Consolidate duplicate code into support functions.
 - Split the bqlock into bqclean and bqdirty locks.
 - Only acquire the wakeup synchronization locks when we cross a
   threshold requiring them.
 - Restructure the way flushbufqueues() targets work so they are more
   smp friendly and sane.

Reviewed by:	kib
Discussed with:	mckusick, attilio
Sponsored by:	EMC / Isilon Storage Division

M    vfs_bio.c