test_daemon: Define a default value for SO_PASSCRED
test_daemon: Define a default value for SO_PASSCRED

The socket module seems to be missing this in python2.7.

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