CentOS: Keep repo files during tests
CentOS: Keep repo files during tests

The content in RDO tends to get updated frequenty, and this sometimes
causes unexpected change during tests.
Let's make sure that repo file is not updated during tests, so that
we don't get failure caused by broken idempotency.

Depends-on: https://review.opendev.org/#/c/752594/
Change-Id: I88bee4f7f2c9f5a4178ba41b5f1ed3c8e818e1c3

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration