DBUS: at_console, no fallback.

[Richard Hughes]

When debugging a problem for a user using gentoo
(http://bugzilla.gnome.org/show_bug.cgi?id=326226) it became obvious
that there was no fallback to root for when at_console was not
compiled-in/enabled. This made testing very difficult, as the DBUS
methods failed even running as the root user!

I've added the root-user case (so root can always do Shutdown() and
UnMount() and stuff) and also re-factored the checks making this easier
to update in the future.

Please review.

Richard.
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