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: I2e2589ecfa6b6a6e27407c9541fa90a314649bec
BUG: 1145623
Signed-off-by: Varun Shastry <vshastry@redhat.com>
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: http://review.gluster.org/8820
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>