Fix C/C++ samples interoperability

Fix C/C++ samples interoperability

This fixes IOT-130

Made the "state" of light resource consistent across samples to be true/false instead of "on"/"off".
Fixed JSON payload parsing in occserver to fix seg fault on PUT request.

Change-Id: I4983c7ec20a274d0ae24f013cd7b7ec95c5815a6
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/345
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sashi Penta <sashi.kumar.penta@intel.com>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>