Fix Unit tests in light of core/devel dropping support for Python < 3.8 and module_utils tests importing controller-side code

[briantist]

SUMMARY

See https://github.com/ansible-collections/overview/issues/45#issuecomment-822858320 and ensuing discussion.

Need to figure out:

• Supported Python versions for this collection
• How that works with support for earlier core versions
• How to handle unit tests for module_utils intended to work against controller and remote side code

ISSUE TYPE

• Bug Report

COMPONENT NAME

ANSIBLE VERSION

CONFIGURATION

OS / ENVIRONMENT

STEPS TO REPRODUCE

EXPECTED RESULTS

ACTUAL RESULTS