pre-install checks: add more during byo install

Add the docker and RPM checks to the list that run at install time.
They can be disabled the same as the existing ones.

Removed cockpit-kubernetes RPM requirement as it no longer is.
Fixed up docker_image_availability to handle oreg_url and other nuances.
Switched to using the openshift_image_tag that's set by openshift_version for
both component and infrastructure images.
Fixed a bug where execute_module was being called with incorrect
positional arg "tmp" as a dict which caused errors down the call stack.

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