Tower needs to not rely upon Openshift.yml from platform-infrastructure

Referenced here: https://dccscr.dsop.io/levelup-automation/platform-apps/blob/b7a26ad3c9fd73b51ef92948a23038b1bd75a78f/ansible-tower-app.yml#L7

The tower install on top of openshift, most likely needs variables from Openshift.yml, however due to the split of the platform apps and platform infra, we need to remove the LOCAL dependency of Openshift.yml for the tower ocp app role.

I know ansible has a way of pulling variables from remote sources, that is probably what needs to be done here to avoid issues.