* module compat for py3.8+ controller
* replaced internal usages of selinux bindings with internal ctypes binding (allows basic selinux operations from any Python interpreter), plus tests
* added new respawn_module API to allow modules to import Python packages that are only available under a well-known interpreter, plus tests
* added respawn logic to modules that need Python libs from a specific system interpreter (apt, apt_repository, dnf, yum)
minimize internal HAVE_SELINUX usage
spurious junk
pep8
* pylint fixes
* add RHEL8 Python 3.8 testing
* more pylint
* import sanity
* unit tests
* changelog update
* fix a bunch of stuff
* tweak changelog
* fix setup_rpm_repo on EL8
* misc sanity/test fixes
* misc feedback tweaks
* fix import fallback in test module
* fix selinux MU test
* fix dnf tests to avoid python-dependent test packages
* add trailing LFs to aliases
* fix yum tests to avoid test package with Python deps
* hack create_repo for EL6 to create noarch package
