olpc-buddy-prop-change.py: use disco to discover gadget's jid
olpc-buddy-prop-change.py: use disco to discover gadget's jid

20071214143106-7fe3f-8d685c607340e6957fc033c63be8b14235472bb5.gz

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