To avoid back-calling the system_keyspace from the messaging layer
let the system_keyspace get the preferred ips vector and pass it
down to the messaging_service.
This is part of the effort to deglobalize the system keyspace
and query context.
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Message-Id: <20211119143523.3424773-1-bhalevy@scylladb.com>