1c5ab5d80c
When setting up clusters in regression tests, a bunch of servers were created, each starting with a singleton configuration containing itself. This is wrong: servers joining to an existing cluster should be started with an empty configuration. It 'worked' because the first server, which we wait for to become a leader before creating the other servers, managed to override the logs and configurations of other servers before they became leaders in their configurations. But if we want to change the logic so that servers in single-server clusters elect themselves as leaders immediately, things start to break. So fix the bug. Message-Id: <20220303100344.6932-1-kbraun@scylladb.com>