This commit provides an environment option to change the behaviour so
that it's possible to declare any changes shoudl be considered a junit
failure.
This is useful when carrying out idempotent testing to ensure that
multiple runs are safe and any changes should be considered a test
failure.
In a CI test of an ansible role the practice would be to run the role
once without this to configure the test system, and tehn to run a second
time including this environment vairable so that the CI engine
processing the junit report recognise any changes to be a test fail.
We couldn't copy to_unicode, to_bytes, to_str into module_utils because
of licensing. So once created it we had two sets of functions that did
the same things but had different implementations. To remedy that, this
change removes the ansible.utils.unicode versions of those functions.
