Converting OTA payload for advertisements to JSON packaging.

Converting OTA payload for advertisements to JSON packaging.

This commit ensures that presence advertisments comply with section
11.3.4, wrt. Table 21 of the OIC Core Specification 0.9. This further
ensures that any OIC Core Spec Compliant project will be able to
send/receive advertisements with IoTivity.

Change-Id: I4df50b5a7e322c6e1c2f422de4de1b5b38fa0af9
Signed-off-by: Joseph Morrow <joseph.l.morrow@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1123
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>