Add http_client to six.moves, add missing functions to urllib2 fix some types in gettext (#262)

third_party/3/six/moves/__init__.pyi

@@ -26,6 +26,7 @@ from itertools import zip_longest as zip_longest
 import six.moves.cPickle as cPickle
 import html.parser as html_parser
 import html.entities as html_entities
+import http.client as http_client
 
 import six.moves.urllib_parse as urllib_parse
 import six.moves.urllib_error as urllib_error