This PR adds the following:
* moves out the presetting procedures, so that two long terminal tests do not have
to run twice
* add methods for application to register when successfully started
* adds a test that checks if all required applications have registered
In the last few weeks Boxes is showing an auth dialog on start.
I've filed a bug on this; let's have the test handle it as a
soft failure, since this isn't a fatal problem. Do this by
making an existing needle for this dialog a bit more generic
in name and using it.
Signed-off-by: Adam Williamson <awilliam@redhat.com>
