I was really struggling with this until I did an rpm -e biosdevname, and all my devices are named eth0 like they used to be now. Cobbler dealt with the device names just fine, but Puppet was having no end of trouble.
unfortunately i think the work flow is:
cobbler system edit --name=foo --interface=eth0 --delete-interface
cobbler system edit --name=foo --interface=em1 --ip-address= blahblahblah
-greg
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