ipatests: Rename create_quarkus to create_keycloak
The module installs and configures a Keycloak server and
not just the Quarkus Java framework. So, renaming to better
reflect what the module is used for.
Fixes: https://pagure.io/freeipa/issue/9225
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>