Comment 3 for bug 1713103

+ su -l -c test-snapd-system-observe-consumer.dbus-introspect test
Traceback (most recent call last):
  File "/snap/test-snapd-system-observe-consumer/6/bin/dbus-introspect", line 10, in <module>
    sys.exit(run())
  File "/snap/test-snapd-system-observe-consumer/6/bin/dbus-introspect", line 6, in run
    obj = dbus.SystemBus().get_object("org.freedesktop.hostname1", "/org/freedesktop/hostname1")
  File "/snap/test-snapd-system-observe-consumer/6/usr/lib/python3/dist-packages/dbus/_dbus.py", line 194, in __new__
    private=private)
  File "/snap/test-snapd-system-observe-consumer/6/usr/lib/python3/dist-packages/dbus/_dbus.py", line 100, in __new__
    bus = BusConnection.__new__(subclass, bus_type, mainloop=mainloop)
  File "/snap/test-snapd-system-observe-consumer/6/usr/lib/python3/dist-packages/dbus/bus.py", line 122, in __new__
    bus = cls._new_for_bus(address_or_type, mainloop=mainloop)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.AccessDenied: Failed to query AppArmor policy: Permission denied