Doing so means we handle the same events as the panel. This probably
makes no difference, but this way it is guaranteed we are not getting
weird inconsistencies during testing.
Also fixes a NMClient memory leak in the process.
This has the side effect of showing UI elements that should not be
visible at startup. Just add the correct gtk_widget_show calls to show
all relevant widgets.
This adds tests for the network panel based on the test service found in
NetworkManager. Another possible solution may be to use the one from
dbusmock, however NetworkManager already has readily available code to
write tests in C which makes checking the widget hierarchy easier.
