Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/@python2/Cookie.pyi

@@ -0,0 +1,40 @@
+from typing import Any, Dict, Optional
+
+class CookieError(Exception): ...
+
+class Morsel(Dict[Any, Any]):
+    key: Any
+    def __init__(self): ...
+    def __setitem__(self, K, V): ...
+    def isReservedKey(self, K): ...
+    value: Any
+    coded_value: Any
+    def set(self, key, val, coded_val, LegalChars=..., idmap=..., translate=...): ...
+    def output(self, attrs: Optional[Any] = ..., header=...): ...
+    def js_output(self, attrs: Optional[Any] = ...): ...
+    def OutputString(self, attrs: Optional[Any] = ...): ...
+
+class BaseCookie(Dict[Any, Any]):
+    def value_decode(self, val): ...
+    def value_encode(self, val): ...
+    def __init__(self, input: Optional[Any] = ...): ...
+    def __setitem__(self, key, value): ...
+    def output(self, attrs: Optional[Any] = ..., header=..., sep=...): ...
+    def js_output(self, attrs: Optional[Any] = ...): ...
+    def load(self, rawdata): ...
+
+class SimpleCookie(BaseCookie):
+    def value_decode(self, val): ...
+    def value_encode(self, val): ...
+
+class SerialCookie(BaseCookie):
+    def __init__(self, input: Optional[Any] = ...): ...
+    def value_decode(self, val): ...
+    def value_encode(self, val): ...
+
+class SmartCookie(BaseCookie):
+    def __init__(self, input: Optional[Any] = ...): ...
+    def value_decode(self, val): ...
+    def value_encode(self, val): ...
+
+Cookie: Any