protected long newGen() {
        long newGen = getNewGeneration();
        if (newGen == 0) return getRequestGeneration();
        return newGen;
    }
Represents version 3 config request for config clients. Provides methods for inspecting request and response
values.

See {@link JRTServerConfigRequestV3} for protocol details.

@author Ulf Lilleengen
config/src/main/java/com/yahoo/vespa/config/protocol/JRTClientConfigRequestV3.java