Add missing stubs for logging.handlers.WatchedFileHandler. (#3686)

Co-authored-by: CyrilRoelandteNovance <cyril@redhat.com>

stdlib/2and3/logging/__init__.pyi

@@ -484,6 +484,7 @@ class FileHandler(StreamHandler):
     delay: bool  # undocumented
     def __init__(self, filename: _Path, mode: str = ...,
                  encoding: Optional[str] = ..., delay: bool = ...) -> None: ...
+    def _open(self) -> IO[Any]: ...
 
 
 class NullHandler(Handler): ...

stdlib/2and3/logging/handlers.pyi

@@ -29,8 +29,11 @@ SYSLOG_UDP_PORT: int
 SYSLOG_TCP_PORT: int
 
 class WatchedFileHandler(FileHandler):
+    dev: int
+    ino: int
     def __init__(self, filename: _Path, mode: str = ..., encoding: Optional[str] = ...,
                  delay: bool = ...) -> None: ...
+    def _statstream(self) -> None: ...
 
 
 if sys.version_info >= (3,):