* MMgrBeacon
* MOSDBoot
* MOSDFailure
* MOSDPGLog
* MOSDRepOp
* MOSDRepOpReply
* MForward (as the container of the messages above)
* LogEntry
as there is not need to decode these in-cluster messages if they are
encoded by pre-nautilus daemons. in quincy, we only need to decode
in-cluster messages generated by octopus and pacific daemons. so
it's safe to stop decoding these 11.0 (kraken) messages.