jasone db944ecf00 For lockmgr mutex protection, use an array of mutexes that are allocated
and initialized during boot.  This avoids bloating sizeof(struct lock).
As a side effect, it is no longer necessary to enforce the assumtion that
lockinit()/lockdestroy() calls are paired, so the LK_VALID flag has been
removed.

Idea taken from:	BSD/OS.
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