Do not fail over readdir in replicate.
Do not fail over readdir in replicate.

If readdir fails on a subvolume, do not
fail-over to the next subvolume, since the
order of entries and offsets won't be same
on all subvolumes.

Signed-off-by: Anand V. Avati <6a1810c170bd423868ce2e225ecea39d80cade0f@dev.gluster.com>

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster