Added unit tests for OCRepresentation to CBOR and back

Added unit tests for OCRepresentation to CBOR and back

These unit tests validate the conversion of OCRepresentation objects
through OCRepPayload and into CBOR, then brings them back.  This
validates all data types, including jagged arrays.

Change-Id: I6c74a29f51febcff8553ac194c5ae57eaa50a460
Signed-off-by: Erich Keane <erich.keane@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2483
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Patrick Lankswert <patrick.lankswert@intel.com>