Fixed 35467 -- Replaced urlparse with urlsplit where appropriate.

This work should not generate any change of functionality, and
`urlsplit` is approximately 6x faster.

Most use cases of `urlparse` didn't touch the path, so they can be
converted to `urlsplit` without any issue. Most of those which do use
`.path`, simply parse the URL, mutate the querystring, then put them
back together, which is also fine (so long as urlunsplit is used).

docs/ref/urlresolvers.txt

@@ -203,7 +203,7 @@ A :class:`ResolverMatch` object can also be assigned to a triple::
 One possible use of :func:`~django.urls.resolve` would be to test whether a
 view would raise a ``Http404`` error before redirecting to it::
 
-    from urllib.parse import urlparse
+    from urllib.parse import urlsplit
     from django.urls import resolve
     from django.http import Http404, HttpResponseRedirect
 
@@ -215,7 +215,7 @@ view would raise a ``Http404`` error before redirecting to it::
         # modify the request and response as required, e.g. change locale
         # and set corresponding locale cookie
 
-        view, args, kwargs = resolve(urlparse(next)[2])
+        view, args, kwargs = resolve(urlsplit(next).path)
         kwargs["request"] = request
         try:
             view(*args, **kwargs)