Update openshift-ansible repositories

openshift-ansible has been ported to ansible-core in RHEL AppStream; the
separate Ansible Engine repository (and its older ansible package) is no
longer used.

Author: yselkowitz

modules/rhel-preparing-playbook-machine.adoc

@@ -63,7 +63,6 @@ If you use SSH key-based authentication, you must manage the key with an SSH age
 # subscription-manager repos \
     --enable="rhel-8-for-x86_64-baseos-rpms" \
     --enable="rhel-8-for-x86_64-appstream-rpms" \
-    --enable="ansible-2.9-for-rhel-8-x86_64-rpms" \
     --enable="rhocp-4.11-for-rhel-8-x86_64-rpms"
 ----