"The previous series handled a passing of the copy of the client_state from process_request(...)
to the process_request_one(...). However the modified copy of the client_state is returned by the
process_request_one(...) back to the process_request(...) and handling of this direction was missing
in the previous series.
This series completes the #2351 fix."
* 'fix-round-robin-cont-v2' of https://github.com/vladzcloudius/scylla:
transport::cql_server::process_request_one: return only the required information instead of the whole client_state object
service::client_state: move auth_state from cql_server::connection to service::client_state
transport::cql_server: don't cache sasl_challenge object in the cql_server::connection
service::client_state::merge(): remove not needed timestamp merge