Fix redis password support. (#7401)

We forgot to set the password on the subscriber connection, as well as
not calling super methods for overridden connectionMade/connectionLost
functions.

stubs/txredisapi.pyi

@@ -22,7 +22,10 @@ class RedisProtocol:
     def publish(self, channel: str, message: bytes): ...
 
 class SubscriberProtocol:
+    password: Optional[str]
     def subscribe(self, channels: Union[str, List[str]]): ...
+    def connectionMade(self): ...
+    def connectionLost(self, reason): ...
 
 def lazyConnection(
     host: str = ...,