rename 50 to align with structure, update site, change warning in 52 prereq check

playbooks/52-coreos-installer.yml

@@ -33,7 +33,7 @@
             - Quay deployment,
             - oc-mirror prerequisites,
             - oc-mirror execution,
-            - coreos-installer prerequisites
+            - OpenShift installation prerequisites
           Exiting.
         success_msg: "OK, dependencies exist."
 

playbooks/site.yml

@@ -15,6 +15,7 @@
 - import_playbook: 40-mirror-prep.yml
 - import_playbook: 45-oc-mirror.yml
 
-- import_playbook: 50-coreos-inst-prep.yml
+- import_playbook: 50-install-prepare.yml
+
 - import_playbook: 52-coreos-installer.yml
 ...