The repository names seem to have changed and no longer have the "rhui-" prefix
* 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.
* Copy in incidental posix tests. * Update incidental test aliases. * Update target names. * Add support plugins. * Fix paths. * Update ignores. * Update integration-aliases sanity test. * Add incidental tests to CI.