Set<String> allConfigNames() {
        Set<String> allNames = new HashSet<>();
        List<ConfigDef> connectorConfigDefs = Arrays.asList(
                MirrorCheckpointConfig.CONNECTOR_CONFIG_DEF,
                MirrorSourceConfig.CONNECTOR_CONFIG_DEF,
                MirrorHeartbeatConfig.CONNECTOR_CONFIG_DEF
        );
        for (ConfigDef cd : connectorConfigDefs) {
            allNames.addAll(cd.names());
        }
        return allNames;
    }
Construct a MirrorClientConfig from properties of the form cluster.x.y.z.
Use to connect to a cluster based on the MirrorMaker top-level config file.
connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorMakerConfig.java