Fixed dns_spoof test
Update changelog
Fix unittest for tor silly listener
Use vulture to find and delete some dead code.
Fix some errors detected with pyflakes
Implement unittests for report lists.

Spot a bug and fix it.
Add a unittest for txscapy.
Fix oonibclient tests.
Make it possible to run ooniprobe also without having dnet installed.
Print out the options that are missing.
No collector means no collector.
Handle the case where no command is specified.
Add extra checks in the body and header comparisons
Don't start tor if no collector option is specified and no test helper is needed.