netty: Associate netty stream eagerly to avoid client hang #12222
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In grpc#12185, RPCs were randomly hanging. In grpc#12207 this was tracked down to the headers promise completing successfully, but the netty stream was null. This was because the headers write hadn't completed but stream.close() had been called by goingAway().
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In #12185, RPCs were randomly hanging. In #12207 this was tracked down to the headers promise completing successfully, but the netty stream was null. This was because the headers write hadn't completed but stream.close() had been called by goingAway().