Change:
- The docker-ce.repo file for centos does not work on RHEL since it uses
$releasever and on RHEL that is, e.g., "7Server".
- Instead, set up the repo manually.
- Additionally, the docker centos8 repo no longer has old versions, so
we use the (only) version in the repo instead.
Test Plan:
- CI
Signed-off-by: Rick Elrod <rick@elrod.me>
* Update tests to use RHEL 7.8.
Keeping support for RHEL 7.6 since collections are still using it.
* Fix tests for RHEL 7.7+ due to extras repo name change.
