socks5: use peer_jid and self_full_jid to compute the domain
socks5: use peer_jid and self_full_jid to compute the domain

We shouldn't use the to attribute of the IQ as the jabber server will
change it to our real jid if the IQ was send in the context of a muc

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