checkHashMatchMD5(contentMD5, completedHash, log) {
        if (contentMD5 && completedHash && contentMD5 !== completedHash) {
            log.debug('contentMD5 and completedHash does not match',
            { method: 'checkHashMatchMD5', completedHash, contentMD5 });
            return false;
        }
        return true;
    }
Check that hashedStream.completedHash matches header contentMd5.
@param {object} contentMD5 - content-md5 header
@param {string} completedHash - hashed stream once completed
@param {RequestLogger} log - the current request logger
@return {boolean} - true if contentMD5 matches or is undefined,
false otherwise