Use expanduser instead of HOME env var
The HOME directory may not be available in containers. It's also the
wrong variable on some platforms. Use os.path.expanduser() instead of
HOME.
Fixes: https://pagure.io/freeipa/issue/7837
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>