gabble_muc_factory_request: use tp_channel_manager_emit_new_channel directly instead of gabble_muc_factory_associate_request when announcing a newly created tubes channel
gabble_muc_factory_request: use tp_channel_manager_emit_new_channel directly instead of gabble_muc_factory_associate_request when announcing a newly created tubes channel

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