Fix the LK_NOSHARE lockmgr flag interaction with LK_UPGRADE and LK_DOWNGRADE lock ops. Namely, the ops should be NOP since LK_NOSHARE locks are always exclusive.
Fix the LK_NOSHARE lockmgr flag interaction with LK_UPGRADE and
LK_DOWNGRADE lock ops. Namely, the ops should be NOP since LK_NOSHARE
locks are always exclusive.

Reported by:	rmacklem
Reviewed by:	attilio
Tested by:	pho
Approved by:	re (kensmith)
MFC after:	1 week

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