performance/stat-prefetch: remove lookup-behind in sp_lookup.

- lookup-behind should be done on-demand basis, in fops like open
    instead of in sp_lookup itself. This would reduce network traffic
    between client and server related to lookup, if the only use of
    lookup was to fetch stat structure.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 284 (performance actually decreases for 'ls -l' on a directory containing large number of files with stat-prefetch loaded)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=284

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