Previously, StompDecoder would throw a StompConversionException when
it attempted to decode a Buffer that contained an incomplete frame.
This commit updates StompDecoder to return null when it encounters an
incomplete frame. It also resets the buffer, thereby allowing the
decode to be reattempted once more data has been received.
StompCodec's decoder function has been updated to stop attempting to
decode a Buffer when StompDecoder returns null.
Issue: SPR-11088
e84885c655