Bug #10288: Fix newly identified issues to make our test suite more robust and faster
"I test Torbirdy's proxy settings" test sometimes fails due to missing favicon in "congratulations" tab
I've seen at least one case when the "congratulations" tab had a generic favicon, instead of the one with the onion logo that we expect. Maybe we should look for the tab's text only?
Dogtailify existing Icedove tests.
... which incidentally fixes the issue we've had with some outdated test
suite images for this feature, and a robustness issue in TorBirdy's
settings dialog. :)
Also, by removing the IMAP scenario, which has been broken ever since we
enabled the autoconfiguration wizard, we fix another failure -- we'll
reintroduce an updated version of it shortly.