The way KDE does update notifications has changed - it's now a
permanent pop-up notification. This is a bit awkward for our
logic; it's hard to define a needle that proves this pop-up is
the only notification. Instead, let's dismiss it, then open the
notification tray and assert that there aren't any others. But
we also retain the old behaviour (more or less) for testing old
releases.
The popup notification also blocks the 'refresh' needle in the
systray and so breaks the desktop update test, so we deal with
that too.
Signed-off-by: Adam Williamson <awilliam@redhat.com>
