function deleteVeeamFile(request, response, bucketMd, log) {
    if (!bucketMd) {
        return responseXMLBody(errors.NoSuchBucket, null, response, log);
    }
    return deleteVeeamCapabilities(request.bucketName, request.objectKey, bucketMd, log, err => {
        if (err) {
            return responseXMLBody(err, null, response, log);
        }
        return responseNoBody(null, null, response, 204, log);
    });
}
Deletes system.xml or capacity.xml files for a given bucket. handle
request context for custom routes.

@param {object} request - request object
@param {object} response - response object
@param {object} bucketMd - bucket metadata from the db
@param {object} log - logger object
@returns {undefined} -