Revert "Close the open fd where we can before unlinking the file."

This reverts commit 7e73132d70e7da652612275e746734f80a308a3a.
Stackable FSAL: Skeletons for this FSALs, duplicating the one from VFS

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Stackable FSAL: uses new_ops array of vectors.
Stackable FSALs: last commit at NNSA meeting

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    Stackable FSALs: should compile but will probably not work

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