Update 'resource broker' unit test code.

Update 'resource broker' unit test code.

1. whether is called timeoutCB correctly or not when is occurred timeover about 'subscribe' request.
2. whether is called subscribeCB correctly or not when is request 'subscribe'.
3. whether is called timeoutCB correctly or not when is occurred timeover about 'get' request.

and, modify some bug.
this bug is not occurred problem at previous version.but correct this point in order to upgrade our unitTest'
performance.

add license comment and delete white space.

add api for 'device presence' in order to get device_state' value.

Change-Id: Ib265c6d529f84610cf134808bc5581377340bec6
Signed-off-by: doil.kwon <doil.kwon@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1987
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>