public static CompressionType getCompressionType() {
        return getCompressionType(System.getenv(VESPA_CONFIG_PROTOCOL_COMPRESSION),
                                  System.getProperty(VESPA_CONFIG_PROTOCOL_COMPRESSION));
    }
To hide JRT implementations.

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