features/snapview-client: handle readdir requests differently for samba

* For samba export, the entry point is also added to the readdir response.

Change-Id: I825c017e0f16db1f1890bb56e086f36e6558a1c2
BUG: 1168875
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: http://review.gluster.org/9218
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>