Fix flaky test depending on internal order.
Fix flaky test depending on internal order.

Python 3 is not consistent in internal order
when using sets, dicts etc and test should
not depend on that being the case.

metatoaster/oauthlib,hirokiky/oauthlib,cyrilchaponeverysens/oauthlib,flamusdiu/oauthlib,flamusdiu/oauthlib,barseghyanartur/oauthlib,singingwolfboy/oauthlib,bjmc/oauthlib,idan/oauthlib,Blitzen/oauthlib,oauthlib/oauthlib,armersong/oauthlib,skion/oauthlib-oidc,mick88/oauthlib,garciasolero/oauthlib