Cleanup of vnode interface continues. Get rid of VHOLD/HOLDRELE.

Change VM/UVM to use buf_replacevnode to change the vnode associated
with a buffer.

Addition v_bioflag for flags written in interrupt handlers
(and read at splbio, though not strictly necessary)

Add vwaitforio and use it instead of a while loop of v_numoutput.

Fix race conditions when manipulation vnode free list

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