CoAP over TCP transmission over BT support for Tizen

CoAP over TCP transmission over BT support for Tizen

currently, CoAP/UDP message format is used over BT-RFCOMM.
but BT-RFCOMM data transmission requires dedicated session
between devices and guarantees reliable data transmission
by its MAC & PHY layer. So, CoAP/TCP message format might
be more efficient for Bluetooth

Change-Id: Ifd4e47174734cf21de7245d3e6a055f8952ce730
Signed-off-by: koushik.girijala <g.koushik@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/4739
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>