Remove include of zope.app.zopeappgenerations that is not useful unless
upgrading a database older than Zope 3.4. This cuts the last dependency on
zope.app.authentication from the ZTK.
Add include of zope.app.schema:configure.zcml. Because component-based
vocabularies are used everywhere and we need to import zope.app.schema
somehow to make it work. This is needed because of removal of the include
of zope.app.schema's meta.zcml in the previous release.