This means that ansible 2.9 is typically used, and causes ansible-lint
to fail. Two workarounds have been added to address this:
* Use .get() to avoid passing an undefined object through to_nice_yaml
filter
* Create a dummy tenks_update_state.py module to avoid ansible-lint
being confused about our action plugin.
Change-Id: I54388f713e17a47601be2db63a26fc43ca7ac6c8