[IoT-1603] Restrict unittest with SECURED mode

[IoT-1603] Restrict unittest with SECURED mode

Fixed segmentation fault from notification-service unit test
when building option with SECURED=1.
The unit test is not allowed with SECURED mode,
becuase provisioning steps are required to detect providers and consumers
for running the test cases.

Change-Id: I02ebfbc8f3afdd2b06d66b87976773fcdc37b030
Signed-off-by: cc <ch79.cho@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14783
Reviewed-by: Jaewook Jung <jw0213.jung@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>