Update bundle export machine placement to bundle v4 format
Update bundle export machine placement to bundle v4 format

mitechie/juju-gui,bac/juju-gui,jrwren/juju-gui,bac/juju-gui,mitechie/juju-gui,jrwren/juju-gui,mitechie/juju-gui,jrwren/juju-gui,bac/juju-gui,mitechie/juju-gui,bac/juju-gui,jrwren/juju-gui