PayloadChecksum getResponseConfigMd5() {
        Inspector md5Field = getResponseField(RESPONSE_CONFIG_MD5);
        return md5Field.valid()
                ? new PayloadChecksum(md5Field.asString(), MD5)
                : PayloadChecksum.empty(MD5);
    }
Contains response data for a slime response and methods for decoding the response data that
are common to all {@link Slime} based config requests.

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