Fix item being ignored in get_info

This, I think, would've caused get_all_jobs to loop indefinitely if the
Jenkins instance has folders. Am I really the first to have caught this?

Change-Id: I4158b0d068135de08a3337486d8a4b41d8b7cda6

jenkins/__init__.py

@@ -770,7 +770,7 @@ class Jenkins(object):
             url += query
         try:
             return json.loads(self.jenkins_open(
-                requests.Request('GET', self._build_url(INFO))
+                requests.Request('GET', self._build_url(url))
             ))
         except (req_exc.HTTPError, BadStatusLine):
             raise BadHTTPException("Error communicating with server[%s]"