Set signal.stopped = True on closing

sanic/server.py

@@ -313,7 +313,8 @@ def serve(host, port, request_handler, error_handler, before_start=None,
           after_start=None, before_stop=None, after_stop=None, debug=False,
           request_timeout=60, ssl=None, sock=None, request_max_size=None,
           reuse_port=False, loop=None, protocol=HttpProtocol, backlog=100,
-          register_sys_signals=True, run_async=False, connections=None):
+          register_sys_signals=True, run_async=False, connections=None,
+          signal=Signal()):
     """Start asynchronous HTTP Server on an individual process.
 
     :param host: Address to host on
@@ -350,7 +351,6 @@ def serve(host, port, request_handler, error_handler, before_start=None,
     trigger_events(before_start, loop)
 
     connections = connections if connections is not None else set()
-    signal = Signal()
     server = partial(
         protocol,
         loop=loop,