bug fix for response of topic and modify unittest.

bug fix for response of topic and modify unittest.

this patch include,
1. bug fix for response of topic post case.
2. modify unittest about included interface type.

Change-Id: I5bba7ef93260c2c67f25d9d79455e383d6ea8c0c
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13219
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
(cherry picked from commit f58cd738051414f36223ea6a6eb6def34a927ba9)
Reviewed-on: https://gerrit.iotivity.org/gerrit/13221