Fix a bug in Controlle.OnVersionedRPCReturned that successful response of non-backup request should be ignored

* Delete stream_creater() and make set_stream_creator can be called only once

the responsibility of stream_data and stream_creator more clearer

* Apply StreamUserData to h2 and rtmp

* Fix socket failed bug in rtmp in connection short case

- Not close the socket when receiving GOAWAY frame to implement gracefully stop

- Set stream creator in serialize_request

TODO: 1. socket management 2. window mechanism

Fix bug: Unit test for circuit_breaker occasionally fails

add circuit_breaker_unittest

Circuit breaker