Issue350 - Don't create quickstarts on OSE installs

This introduces quickstarts_json class parameter that if set will be deployed to
/etc/openshift/quickstarts.json. If undef and ose_version is undef then the
template in templates/broker/quickstarts.json.erb will be rendered. If
undef and ose_version != undef then an empty quickstarts file will be
deployed.