fix url/realm type (fixes #480)
fix url/realm type (fixes #480)

crossbario/autobahn-python,meejah/AutobahnPython,Jenselme/AutobahnPython,hzruandd/AutobahnPython,ttimon7/AutobahnPython,crossbario/autobahn-python,oberstet/autobahn-python,crossbario/autobahn-python,nucular/AutobahnPython,oberstet/autobahn-python,jvdm/AutobahnPython,inirudebwoy/AutobahnPython,Geoion/AutobahnPython,tavendo/AutobahnPython,RyanHope/AutobahnPython,markope/AutobahnPython,oberstet/autobahn-python,schoonc/AutobahnPython