Merge PR #24305 into master

* refs/pull/24305/head:
	msg/async: ProtocolV1: use continuations instead of direct function calls
	msg/async: ProtocolV1 state machine ascii diagram

Reviewed-by: Adam C. Emerson <aemerson@redhat.com>

diff --cc src/msg/async/AsyncConnection.cc
Simple merge

diff --cc src/msg/async/Protocol.cc
Simple merge