cluster/afr: Set all the xattrs needed by index xlator

Index xlator removes the index file from indices
xattrop directory in case the value for keys sent
are zero.

If all the required keys are not set by afr
then index file might be removed in an invalid
way.

With this change all the keys required by index
xlator are set by afr such that invalid removal of
files does not occur.

Change-Id: Idbed0764a95157fd5cab8d6685057a43788fc7df
BUG: 1139230
Signed-off-by: Anuradha <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/8652
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Pranith Kumar Karampuri <pkarampu@redhat.com>