Revert "plone.supermodel and plone.registry added to auto-checkout.  plone.registry Choice field construction needs to accommodate optional use of SimpleVocabulary that can be converted into values to accommodate fix from https://github.com/plone/plone.supermodel/commit/f16f480b6062a44bda6f729f03de4555c65c82b0  -- plone.registry changes should be released prior or concurrent to plone.supermodel release."
According to jenkins this commit broke 39 tests on the Plone 4.3 - Python 2.7 build.

This reverts commit 7c8bbd58eb81e54d871a2d8e09f6e62bd0462088.