test_main():  Restore the original root logger level after running the tests.  This stops the confusing/annoying:
test_main():  Restore the original root logger level after running
the tests.  This stops the confusing/annoying:

    No handlers could be found for logger "cookielib"

message we got whenever some test running after test_logging
happened to use cookielib.py (when not using regrtest's -r,
this happened during test_urllib2; when using -r, it varied).

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator