features/marker: Fill loc->path before sending the control to healing

        Backport of: http://review.gluster.org/8296

Problem:
The xattr healing part of the marker requires path to be present in the loc.
Currently path is not filled while triggering from the readdirp_cbk.

Solution:
Current patch tries to fill the loc with path.

Change-Id: Icc16c740bc6453714306eae19526e18c1775c1d8
BUG: 1144315
Signed-off-by: Varun Shastry <vshastry@redhat.com>
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: http://review.gluster.org/8778
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>