authentication nagging with colord and remote sessions (regression)

[CendioOssman]

This is a regression caused by #5 and commit 26dc57d. Some downstream reports:

https://bugzilla.redhat.com/show_bug.cgi?id=1149893
https://bugzilla.redhat.com/show_bug.cgi?id=1237146

Not sure if Gnome or colord is to blame here, but it was colord that triggered it at least.