Merge Python 3.4

* Issue #19811, #22022: test_pathlib uses support.rmtree() instead of
  shutil.rmtree() to remove the temporary directory.

* Issue #19629: Fix support.rmtree(), use os.lstat() to check if the file is a
  directory, not os.path.isdir()

Lib/test/support/__init__.py

@@ -316,7 +316,13 @@ if sys.platform.startswith("win"):
         def _rmtree_inner(path):
             for name in os.listdir(path):
                 fullname = os.path.join(path, name)
-                if os.path.isdir(fullname):
+                try:
+                    mode = os.lstat(fullname).st_mode
+                except OSError as exc:
+                    print("support.rmtree(): os.lstat(%r) failed with %s" % (fullname, exc),
+                          file=sys.__stderr__)
+                    mode = 0
+                if stat.S_ISDIR(mode):
                     _waitfor(_rmtree_inner, fullname, waitall=True)
                     os.rmdir(fullname)
                 else:

Lib/test/test_pathlib.py

@@ -1214,7 +1214,7 @@ class _BasePathTest(object):
 
     def setUp(self):
         os.mkdir(BASE)
-        self.addCleanup(shutil.rmtree, BASE)
+        self.addCleanup(support.rmtree, BASE)
         os.mkdir(join('dirA'))
         os.mkdir(join('dirB'))
         os.mkdir(join('dirC'))
@@ -1419,7 +1419,7 @@ class _BasePathTest(object):
         self._check_resolve_relative(p, P(BASE, 'dirB', 'fileB'))
         # Now create absolute symlinks
         d = tempfile.mkdtemp(suffix='-dirD')
-        self.addCleanup(shutil.rmtree, d)
+        self.addCleanup(support.rmtree, d)
         os.symlink(os.path.join(d), join('dirA', 'linkX'))
         os.symlink(join('dirB'), os.path.join(d, 'linkY'))
         p = P(BASE, 'dirA', 'linkX', 'linkY', 'fileB')