systemd-python: wrap some python differences using macros
systemd-python: wrap some python differences using macros

again4you/python-systemd,keszybz/python-systemd,Awesense/python-systemd,Awesense/python-systemd,keszybz/python-systemd,Awesense/python-systemd,again4you/python-systemd,systemd/python-systemd,systemd/python-systemd