Relax protocol violations (#1128)
Relax protocol violations (#1128)

* skip in case of unknown INTERRUPT
* skip if GOODBYE already sent
* reduce log noise

oberstet/autobahn-python,crossbario/autobahn-python,crossbario/autobahn-python,oberstet/autobahn-python,oberstet/autobahn-python,tavendo/AutobahnPython,crossbario/autobahn-python