Fix typo (entry no longer exists).

Change-Id: I7ad07fa2328fd3d5db7375be86c40d21bf9ab039
entry_processor: add stage locking on parent_id/name value.

Add a stage locking mechanism on parent_id+name, not only on fid.
This avoids processing UNLINK-HLINK or RMDIR-MKDIR sequence in an
arbitrary order, which could lead to a wrong FS representation in DB.

Change-Id: Id26bf56dda6beacb95db8f5b9918a8043f79ef9c
changelog reader: config parameter to dump all changelogs to a file.

For troubleshooting, or just to kept trace of filesystem operations.
This can be enabled by specifying the 'dump_file' option in the
changelog reader config.

Change-Id: I4c77e5bc1819659e1e9507bb50890aa33309a97a