Fix test_site_update_url()

     def test_site_update_url():
        with requests.get(Options.update_site_url) as resp:
>           resp.raise_for_status()

resp       = <Response [403]>

tests/unit/test_options.py:252: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <Response [403]>

    def raise_for_status(self):
        """Raises :class:`HTTPError`, if one occurred."""
    
        http_error_msg = ''
        if isinstance(self.reason, bytes):
            # We attempt to decode utf-8 first because some servers
            # choose to localize their reason strings. If the string
            # isn't utf-8, we fall back to iso-8859-1 for all other
            # encodings. (See PR #3538)
            try:
                reason = self.reason.decode('utf-8')
            except UnicodeDecodeError:
                reason = self.reason.decode('iso-8859-1')
        else:
            reason = self.reason
    
        if 400 <= self.status_code < 500:
            http_error_msg = u'%s Client Error: %s for url: %s' % (self.status_code, reason, self.url)
    
        elif 500 <= self.status_code < 600:
            http_error_msg = u'%s Server Error: %s for url: %s' % (self.status_code, reason, self.url)
    
        if http_error_msg:
>           raise HTTPError(http_error_msg, response=self)
E           requests.exceptions.HTTPError: 403 Client Error: Forbidden for url: https://community.nuxeo.com:443/static/drive-updates/