Platform ID must be UUID

Platform ID must be UUID
Change sleep() to wait()/notify()

Platform ID change was due to this commit https://gerrit.iotivity.org/gerrit/#/c/14991/
wait()/notify() improves performance

Change-Id: I5c1bca6939243eec9cbb52893c7e376ac422cb7c
Signed-off-by: Larry Sachs <larry.j.sachs@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15573
Reviewed-by: George Nash <george.nash@intel.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>