Issue #7449, part 9: fix test_xmlrpclib for missing threading module
Issue #7449, part 9: fix test_xmlrpclib for missing threading module

 * Skip testcases using threads if threading module is missing
 * Use "http://" instead of URL in ServerProxyTestCase if threading is missing
   because URL is not set in this case

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