Fix the new NFSv4 server so that it only allows Lookup of directories and symbolic links when traversing non-exported file systems. Found during the recent NFSv4 interoperability Bakeathon.
Fix the new NFSv4 server so that it only allows Lookup of
directories and symbolic links when traversing non-exported
file systems. Found during the recent NFSv4 interoperability
Bakeathon.

MFC after:	2 weeks

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