As per https://github.com/Parallels/vagrant-parallels/issues/1#issuecomment-22987003 or http://stackoverflow.com/questions/17896984/how-to-get-the-ip-address-used-by-a-parallels-vm-from-the-host the output from "prlctl" never seems to contain an IP address - but https://github.com/jenkinsci/parallels-desktop-plugin/blob/master/src/main/java/com/parallels/desktopcloud/ParallelsDesktopConnectorSlaveComputer.java#L76-L92 relies on it

Perhaps a `prlctl exec` based solution would be more robust?