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

	Backport of: http://review.gluster.org/8652

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: I1b77904920c8566057415c52242179aec6a015e2
BUG: 1144744
Signed-off-by: Anuradha <atalur@redhat.com>
Reviewed-on: http://review.gluster.org/8788
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>