Redis backend doesn't override `close` method

[wolever]

So there's no way that the connection will be closed. I believe it should be:

def close(self):
    if self.connection is not None:
        self.connection.disconnect()

[ask]

Thanks! This is already working in Kombu it seems. Tried to fix this in 22a0fcd865b618cbbbfd102efd88a7983507c24e Could you verify if this solves the issue?