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This approach should make it easier to add new checks without having to
write lots of YAML and doing things against Ansible (e.g.
ignore_errors).
A single action plugin determines what checks to run per each host,
including arguments to the check. A check is implemented as a class with
a run method, with the same signature as an action plugin and module,
and is normally backed by a regular Ansible module.
Each check is implemented as a separate Python file. This allows whoever
adds a new check to focus solely in a single Python module, and
potentially an Ansible module within library/ too.
All checks are automatically loaded, and only active checks that are
requested by the playbook get executed.
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Trying to improve the name, `init` needs to be loaded before calling other
subroles.
We don't make `init` a dependency of `common`, `masters` and `nodes` to
avoid running the relatively slow `openshift_facts` multiple times.
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Allow reuse via role dependency.
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We can use openshift_facts's service_type to determine the package
names.
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Note: on a simple example run of ansible-playbook against a single
docker-based host, I saw the execution time jump from 7s to 17s. That's
unfortunate, but it is probably better to reuse openshift_facts, than to
come up with new variables.
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