[IoT-1557] Bug fix about related relay server.

[IoT-1557] Bug fix about related relay server.

This patch include,
missing the declare of function.

Change-Id: I1b543402a9ba8487029d8b59e806c6b570439652
Signed-off-by: jaesick.shin <jaesick.shin@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14313
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
(cherry picked from commit ff0148a824e06fd94c5a67a7e6133391fb336f01)
Reviewed-on: https://gerrit.iotivity.org/gerrit/14809
Reviewed-by: JungYong KIM <jyong2.kim@samsung.com>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Reviewed-by: Chihyun Cho <ch79.cho@samsung.com>