Count pages not buffers. This fixes deadlock condition which mainly

occurs on the fs with large block size. We can have situation where
numcleanbufs < locleanbufs and numdirtybufs < hidirtybufs.  So, buffer
flushing daemon never wakeups and other processes asleep forever waiting
for a clean buffers. We count pages only for the dirty buffers which are
on freelist(BQ_DIRTY).

niklas@ found this.

Rename flasher to cleaner. Suggested by costa@.

Discussed with niklas@, costa@, millert@, art@.
Ok deraadt@.

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