Run of lintian-fixes for unittest2

Try this locally (using the lintian-brush package):

debcheckout unittest2
cd unittest2
lintian-brush
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Ran 383 tests in 0.338s

OK (skipped=3)
I: pybuild base:217: python3.7 -m unittest2
................................................................s........s.......................................................................................................................................F.....................F.......................................................................................................................................................
======================================================================
FAIL: test_loadTestsFromName__relative_malformed_name (unittest2.test.test_loader.Test_TestLoader)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/<<PKGBUILDDIR>>/unittest2/test/test_loader.py", line 425, in check_module_lookup_error
    "'module' object has no attribute '%s'" % attr, attr, regex)
  File "/<<PKGBUILDDIR>>/unittest2/test/test_loader.py", line 417, in _check_module_lookup_error
    'missing error string in %r' % error)
  File "/<<PKGBUILDDIR>>/unittest2/case.py", line 1097, in assertIn

Summary

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