Add & fix unittest of easy setup.

Add & fix unittest of easy setup.

- Add unit test cases
(1) Enrollee handles individual get request from client.
(2) Enrollee handles put request from client.
(3) ESSetCallbackForUserdata API unit test is added.

- Remove GetTargetNetworkInfoFromProvResource API in resourcehandler.
  . This API is not need anymore.

Change-Id: If634923b0daaf9760b78b3d7e853c823769db6ba
Signed-off-by: sy01.youn <sy01.youn@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10603
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jihun Ha <jihun.ha@samsung.com>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>