Update a resource model of configuration/diagnostics resources

Update a resource model of configuration/diagnostics resources

We decide to change a resource model from IPSO model to OIC
(resource-attribute)model. By this decision, configuration/diagnostics
resource's server applications utilized by Things Manager are changed.
And ThingsConfiguration and ThingsDiagnostics SDK implementations are also
slightly changed.
Additionally, fix an exception problem in con-server application, which
is refered in [IoT-392]

Change-Id: I267885d710390b3aee7fdd4852c2de33c9300f87
Signed-off-by: Jihun Ha <jihun.ha@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/514
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Uze Choi <uzchoi@samsung.com>