Download the master database
    :param ftp: ftp connection
    :param ftp_path: path to file on the ftp server
    :param local_path: local path to download file
    :return:

def ftp_download(ftp, ftp_path, local_path):
    """
    Download the master database
    :param ftp: ftp connection
    :param ftp_path: path to file on the ftp server
    :param local_path: local path to download file
    :return:
    """
    with open(local_path, 'wb') as _f:
        ftp.retrbinary('RETR %s' % ftp_path, _f.write)