ansible venv not in path and playbook fails with "boto3 required for this module" error

[simaishi]

PYTHON3_MODULE_PATHS was never updated to include the ansible venv path when we moved to python3 (CentOS8) and it can't find the python modules.

I'm not sure if adding "/var/lib/manageiq/venv/lib/python3.6/site-packages" to the path is the only thing needed, so opening an issue.

cc @NickLaMuro

[Fryguy]

Possibly related, but I'm starting to think (maybe not for jansa), if we should just completely remove any out of the box python modules, and enforce that the user uses a proper requirements file in their playbooks.

[NickLaMuro]

For now, this should be addressed here:

#20322