build: Support SECURED mode in csdk connectivity test

build: Support SECURED mode in csdk connectivity test

Bug: https://jira.iotivity.org/browse/IOT-1684
Change-Id: I6b47f7b3439b923ec12f26b0e159e3b7a1144658
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12721
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/8175
Reviewed-by: George Nash <george.nash@intel.com>
Reviewed-by: Greg Zaverucha <gregz@microsoft.com>
Reviewed-by: Nivedita Singhvi <niveditasinghvi@gmail.com>