Merge PR #27566 into master

Merge PR #27566 into master

* refs/pull/27566/head:
	auth: kill AuthUnknownSessionHandler
	auth: kill AuthUnknown* (except AuthUnknownSessionHandler)
	msg: remove old ms_* auth methods from Dispatcher interface
	mon/MonClient: discard old challenge if authorizer is bad
	msg/async/ProtocolV1: use AuthServer and AuthClient
	mon/Monitor: handle v1 call into handle_auth_request
	msg/Connection: add is_msgr2()
	mon/MonClient: tolerate lack of authorizer for some dispatchers

Reviewed-by: Ricardo Dias <rdias@suse.com>