performance/stat-prefetch: don't cache dentries corresponding to directory.

- distribute picks up the inode number from hashed subvolume. But readdir
    is done from different subvolumes based on the offset. Hence there is a
    possibility of inode number and device number for directories being
    inconsistent between two stat calls.

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

BUG: 371 (rm -rf fails on stat-prefetch.)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=371

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