It's not really a good idea to have the comments that explain
the test_flags in *every* test, because they can go stale and
then we either have to live with them being old or update them
all. Like, now. So let's just take 'em all out. There's always
a reference in the openQA and os-autoinst docs, and those get
updated faster.
More importantly, add the new `ignore_failure` flag to relevant
tests - all the tests that don't have the 'important' or
'fatal' flag at present. Upstream killed the 'important' flag
(making all tests 'important' by default), I got it replaced
with the 'ignore_failure' flag, we now need to explicitly mark
all modules we want the 'ignore_failure' behaviour for.
