Add a VOP_VPTOCNP implementation for pseudofs which covers file systems such as procfs and linprocfs.
Add a VOP_VPTOCNP implementation for pseudofs which covers file systems
such as procfs and linprocfs.

This implementation's locking was enhanced by kib.

Reviewed by:	kib
		des
Approved by:	des
		kib
Tested by:	pho

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