add escape character `|` to `url`

def escape(url):
    '''
    add escape character `|` to `url`
    '''
    if salt.utils.platform.is_windows():
        return url

    scheme = urlparse(url).scheme
    if not scheme:
        if url.startswith('|'):
            return url
        else:
            return '|{0}'.format(url)
    elif scheme == 'salt':
        path, saltenv = parse(url)
        if path.startswith('|'):
            return create(path, saltenv)
        else:
            return create('|{0}'.format(path), saltenv)
    else:
        return url