[K42-discussion] disable symlink caching patch

[Patrick Bozeman]

This patch may be controversial, I'm not sure.   I basically changed the 
behavior from always returning the cached contents of a symlink to 
always calling fsFile->readlink().   See the comment in the patch.

I left the code in that actually keeps the symlink value in the 
nameholder even though we don't end up reusing it in this patch.
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