[FIX] http: fix jsonp, session_id no longer exists

`session_id` is deprecated,
`session.sid` must be used instead.

This is similiar to the revision
4033ccc129

odoo/http.py

@@ -619,7 +619,7 @@ class JsonRequest(WebRequest):
             # If we use jsonp, that's mean we are called from another host
             # Some browser (IE and Safari) do no allow third party cookies
             # We need then to manage http sessions manually.
-            response['session_id'] = self.session_id
+            response['session_id'] = self.session.sid
             mime = 'application/javascript'
             body = "%s(%s);" % (self.jsonp, json.dumps(response),)
         else: