fixed wrong waiting for scanned device.

fixed wrong waiting for scanned device.

when scanning is waiting for target device for unicast.
there is no delay time in previous logic.
so send was failed

Change-Id: I8b7d3b71e462434d1f31f273c5b2dcbb5e0e9f28
Signed-off-by: jihwan.seo <jihwan.seo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5689
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jon@joncruz.org>
(cherry picked from commit 9ac6be815366eb44653b514643b71df92cc5b919)
Reviewed-on: https://gerrit.iotivity.org/gerrit/5741