Leaving this here for future reference.
After the ACI fabric is upgraded, you must update the egg files in your acicobra SDK.
The egg files are available on your upgraded controller.
Download the egg files to wherever you store them on your system. Mine are in /home/bob/Cobra.
Once the files are downloaded, uninstall the current acicobra and reinstall the new version.
bob@UbuntuBob:~/Cobra$ pip uninstall acicobra
bob@UbuntuBob:~/Cobra$ sudo easy_install -Z ./acimodel-2.1_1h-py2.7.egg
bob@UbuntuBob:~/Cobra$ sudo easy_install -Z ./acicobra-2.1_1h-py2.7.egg