- Remove a race between fsync like functions and flushbufqueues() by

   requiring locked bufs in vfs_bio_awrite().  Previously the buf could
   have been written out by fsync before we acquired the buf lock if it
   weren't for giant.  The cluster_wbuild() handles this race properly but
   the single write at the end of vfs_bio_awrite() would not.
 - Modify flushbufqueues() so there is only one copy of the loop.  Pass a
   parameter in that says whether or not we should sync bufs with deps.
 - Call flushbufqueues() a second time and then break if we couldn't find
   any bufs without deps.

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