avatar-requirements.py: test GetAll both before and after connecting
avatar-requirements.py: test GetAll both before and after connecting

The initial implementation of this feature in Haze crashed if these
properties were retrieved before connecting.

Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,Ziemin/telepathy-gabble,jku/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble,jku/telepathy-gabble,jku/telepathy-gabble