static boolean configOrGenerationHasChanged(RawConfig config, JRTServerConfigRequest request) {
        return (config != null && ( ! config.hasEqualConfig(request) || config.hasNewerGeneration(request)));
    }
A proxy server that handles RPC config requests. The proxy can run in two modes:
'default' and 'memorycache', where the last one will not get config from an upstream
config source, but will serve config from memory cache only.

@author hmusum
config-proxy/src/main/java/com/yahoo/vespa/config/proxy/ProxyServer.java