Add PMSingleDiscovery function for discover owned/unowned devices in specified endpoint

Add PMSingleDiscovery function for discover owned/unowned devices in specified endpoint
this function will return when found one or more device even though timeout is not exceeded

Change-Id: Ib03a775bb4142466274bb38517433803971a4213
Signed-off-by: Sijae Kim <sijae.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10461
Reviewed-by: Jongmin Choi <jminl.choi@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jongho Park <jh8397.park@samsung.com>
Reviewed-by: dongik Lee <dongik.lee@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>