features/gfid-access: Handle loc modification correctly for virtual dirs

Change-Id: I6e3321534dc2f711519b18e8bffb691ab952a8ba
BUG: 1112659
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/8163
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>