test/ci: ensure AWS instances have public hostname

This hostname would be used to communicate to the cluster, so it has to
be reset from `ec2.internal`

test/ci/launch.yml

@@ -75,7 +75,9 @@
   tasks:
     - wait_for_connection: {}
     - setup: {}
-
+    - name: Make sure hostname is set to public ansible host
+      hostname:
+        name: "{{ ansible_host }}"
 
 - import_playbook: ../../playbooks/openshift-node/network_manager.yml
 - import_playbook: ../../playbooks/prerequisites.yml