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

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: I5c7dc9de60fa79ca0fe9b58d2636fd1355add0d3
BUG: 1118591
Signed-off-by: Varun Shastry <vshastry@redhat.com>
Reviewed-on: http://review.gluster.org/8296
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Tested-by: Raghavendra G <rgowdapp@redhat.com>