Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/@python2/urllib.pyi

@@ -0,0 +1,133 @@
+from typing import IO, Any, AnyStr, List, Mapping, Sequence, Text, Tuple, TypeVar, Union
+
+def url2pathname(pathname: AnyStr) -> AnyStr: ...
+def pathname2url(pathname: AnyStr) -> AnyStr: ...
+def urlopen(url: str, data=..., proxies: Mapping[str, str] = ..., context=...) -> IO[Any]: ...
+def urlretrieve(url, filename=..., reporthook=..., data=..., context=...): ...
+def urlcleanup() -> None: ...
+
+class ContentTooShortError(IOError):
+    content: Any
+    def __init__(self, message, content) -> None: ...
+
+class URLopener:
+    version: Any
+    proxies: Any
+    key_file: Any
+    cert_file: Any
+    context: Any
+    addheaders: Any
+    tempcache: Any
+    ftpcache: Any
+    def __init__(self, proxies: Mapping[str, str] = ..., context=..., **x509) -> None: ...
+    def __del__(self): ...
+    def close(self): ...
+    def cleanup(self): ...
+    def addheader(self, *args): ...
+    type: Any
+    def open(self, fullurl: str, data=...): ...
+    def open_unknown(self, fullurl, data=...): ...
+    def open_unknown_proxy(self, proxy, fullurl, data=...): ...
+    def retrieve(self, url, filename=..., reporthook=..., data=...): ...
+    def open_http(self, url, data=...): ...
+    def http_error(self, url, fp, errcode, errmsg, headers, data=...): ...
+    def http_error_default(self, url, fp, errcode, errmsg, headers): ...
+    def open_https(self, url, data=...): ...
+    def open_file(self, url): ...
+    def open_local_file(self, url): ...
+    def open_ftp(self, url): ...
+    def open_data(self, url, data=...): ...
+
+class FancyURLopener(URLopener):
+    auth_cache: Any
+    tries: Any
+    maxtries: Any
+    def __init__(self, *args, **kwargs) -> None: ...
+    def http_error_default(self, url, fp, errcode, errmsg, headers): ...
+    def http_error_302(self, url, fp, errcode, errmsg, headers, data=...): ...
+    def redirect_internal(self, url, fp, errcode, errmsg, headers, data): ...
+    def http_error_301(self, url, fp, errcode, errmsg, headers, data=...): ...
+    def http_error_303(self, url, fp, errcode, errmsg, headers, data=...): ...
+    def http_error_307(self, url, fp, errcode, errmsg, headers, data=...): ...
+    def http_error_401(self, url, fp, errcode, errmsg, headers, data=...): ...
+    def http_error_407(self, url, fp, errcode, errmsg, headers, data=...): ...
+    def retry_proxy_http_basic_auth(self, url, realm, data=...): ...
+    def retry_proxy_https_basic_auth(self, url, realm, data=...): ...
+    def retry_http_basic_auth(self, url, realm, data=...): ...
+    def retry_https_basic_auth(self, url, realm, data=...): ...
+    def get_user_passwd(self, host, realm, clear_cache=...): ...
+    def prompt_user_passwd(self, host, realm): ...
+
+class ftpwrapper:
+    user: Any
+    passwd: Any
+    host: Any
+    port: Any
+    dirs: Any
+    timeout: Any
+    refcount: Any
+    keepalive: Any
+    def __init__(self, user, passwd, host, port, dirs, timeout=..., persistent=...) -> None: ...
+    busy: Any
+    ftp: Any
+    def init(self): ...
+    def retrfile(self, file, type): ...
+    def endtransfer(self): ...
+    def close(self): ...
+    def file_close(self): ...
+    def real_close(self): ...
+
+_AIUT = TypeVar("_AIUT", bound=addbase)
+
+class addbase:
+    fp: Any
+    def read(self, n: int = ...) -> bytes: ...
+    def readline(self, limit: int = ...) -> bytes: ...
+    def readlines(self, hint: int = ...) -> List[bytes]: ...
+    def fileno(self) -> int: ...  # Optional[int], but that is rare
+    def __iter__(self: _AIUT) -> _AIUT: ...
+    def next(self) -> bytes: ...
+    def __init__(self, fp) -> None: ...
+    def close(self) -> None: ...
+
+class addclosehook(addbase):
+    closehook: Any
+    hookargs: Any
+    def __init__(self, fp, closehook, *hookargs) -> None: ...
+    def close(self): ...
+
+class addinfo(addbase):
+    headers: Any
+    def __init__(self, fp, headers) -> None: ...
+    def info(self): ...
+
+class addinfourl(addbase):
+    headers: Any
+    url: Any
+    code: Any
+    def __init__(self, fp, headers, url, code=...) -> None: ...
+    def info(self): ...
+    def getcode(self): ...
+    def geturl(self): ...
+
+def unwrap(url): ...
+def splittype(url): ...
+def splithost(url): ...
+def splituser(host): ...
+def splitpasswd(user): ...
+def splitport(host): ...
+def splitnport(host, defport=...): ...
+def splitquery(url): ...
+def splittag(url): ...
+def splitattr(url): ...
+def splitvalue(attr): ...
+def unquote(s: AnyStr) -> AnyStr: ...
+def unquote_plus(s: AnyStr) -> AnyStr: ...
+def quote(s: AnyStr, safe: Text = ...) -> AnyStr: ...
+def quote_plus(s: AnyStr, safe: Text = ...) -> AnyStr: ...
+def urlencode(query: Union[Sequence[Tuple[Any, Any]], Mapping[Any, Any]], doseq=...) -> str: ...
+def getproxies() -> Mapping[str, str]: ...
+def proxy_bypass(host: str) -> Any: ...  # Undocumented
+
+# Names in __all__ with no definition:
+#   basejoin