The production directory is a relic from the puppet environment concept,
which we do not use. Remove it.
The puppet apply tests run puppet locally, where the production
environment is still needed, so don't update the paths in the
tools/prep-apply.sh.
Depends-On: https://review.openstack.org/592946
Change-Id: I82572cc616e3c994eab38b0de8c3c72cb5ec5413