Fix minor issues with a3 setup
Fix minor issues with a3 setup

* ensure policycompass buildout config is used
* add git checkout as dependency of bootstrap

policycompass/policycompass,policycompass/policycompass,FabiApfelkern/policycompass,policycompass/policycompass,FabiApfelkern/policycompass,FabiApfelkern/policycompass