Make multiprocessing.Queue a subclass of queue.Queue

Also change multiprocessing.Queue's put and get timeout arguments to
allow None.

This fixes a problem with logging.handlers.QueueHandler and
QueueListener not accepting a multiprocessing.Queue as the queue
argument.

Author: bcl

stdlib/3/multiprocessing/__init__.pyi

@@ -8,6 +8,7 @@ from multiprocessing.managers import SyncManager
 from multiprocessing.pool import AsyncResult
 from multiprocessing.process import current_process as current_process
 import sys
+import queue
 
 class Lock():
     def acquire(self, block: bool = ..., timeout: int = ...) -> None: ...
@@ -93,10 +94,10 @@ class Process():
     def is_alive(self) -> bool: ...
     def join(self, timeout: Optional[float] = ...) -> None: ...
 
-class Queue():
+class Queue(queue.Queue):
     def __init__(self, maxsize: int = ...) -> None: ...
-    def get(self, block: bool = ..., timeout: float = ...) -> Any: ...
-    def put(self, item: Any, block: bool = ..., timeout: float = ...) -> None: ...
+    def get(self, block: bool = ..., timeout: Optional[float] = ...) -> Any: ...
+    def put(self, item: Any, block: bool = ..., timeout: Optional[float] = ...) -> None: ...
     def qsize(self) -> int: ...
     def empty(self) -> bool: ...
     def full(self) -> bool: ...