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Backport upstream hide systemd dynamic users fix

Merged Cody Garver requested to merge codygarver-guest/lightdm:backport-hide-systemd-dynamic-users into debian/master

As seen here: https://github.com/CanonicalLtd/lightdm/pull/38

From upstream PR:

systemd creates "dynamic users". These accounts should be hidden from login screen.
But it's possible that systemd creates them with id > 1000 and shell == "/sbin/nologin".

Currently lightdm shows these accounts if AccountService is not installed. See:
https://bbs.archlinux.org/viewtopic.php?id=238704

To fix this, add "/sbin/nologin" to ignored shells.

Please see: http://0pointer.net/blog/dynamic-users-with-systemd.html