logilab-common #105845 [testlib] tags don't work with python 3 [validation pending]

see skipped test case

prioritynormal
typebug
done in1.0.0
load0.500
load left0.000
closed by#b7947586b1ba [test] run TagsTC.test_tagged_class on python 3
patch[test] run TagsTC.test_tagged_class on python 3 [applied][testlib] Deal with set binary operator changes from python 3 [applied][pytest] use method.__self__.__class__ instead of method.im_class [applied][test] instantiate TestCase before calling runner.does_match_tags [applied]