tests: An Ansible connection failure does not abort further execution

[moreati]

The config for the Ansible test suite sets any_errors_fatal = true. Despite this if a target fails to connect, execution of the test suite contains, e.g. #1186. This obscures the source of a test failure.

I'm unsure if the semantics of any_errors_fatal are different to my expectations, or it's somehow misconfigured. It's highly unlikely to be a bug in Ansible, but I can't rule it out.