Revert "udev: network device renaming - immediately give up if the target name isn't available"
This reverts commit 97595710. Since we are keeping the old persistent network interface naming for now, and make the new naming scheme  explictly opt-in , re-apply this old hack to make the renaming less likely to fail.  http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/  d5051f76
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