Otherwise, if we expect a stanza and biboumi never sends it, we just hang
here.
Now, we display a nice error after 10 seconds, and move on to the next test,
as other failures (xpath doesn’t match) do
Some duplication is avoided, but most importantly: it’s much much cleaner,
easier to find, functions have been cleaned up (functools.partial usages are
now hidden), etc.
louiz’