When user 'root' login, don't load user 'root' cache file
User root
is in the default_excludes list, so when accountsservice daemon startup, daemon doesn't load user root
cache file if user root
has cache file in /var/lib/Accounsservice/users.
On gnome click 'Not listed?" button to login as user root
, accountsservice still doesn't load cache file. This make user root
login always as default session, not the saved session in cache file.