Added unit test cases for missed out APIs of mediator in easy-setup.

Added unit test cases for missed out APIs of mediator in easy-setup.

Unit test case for requestToConnect and provisionCloudProperties APIs.
This improves code coverage as well.

Change-Id: Ice5f616150269c9b375d47a7dd3eb23c0fec95a5
Signed-off-by: Senthil Kumar G S <senthil.gs@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/19991
Reviewed-by: Phil Coval <philippe.coval@osg.samsung.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Jihun Ha <jihun.ha@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>