move self.server_side to Message class

app/src/async_stream.py

@@ -11,11 +11,10 @@ class AsyncStream(Message):
 
     def __init__(self, reader, writer, addr, remote_stream, server_side: bool
                  ) -> None:
-        super().__init__()
+        super().__init__(server_side)
         self.reader = reader
         self.writer = writer
         self.remoteStream = remote_stream
-        self.server_side = server_side
         self.addr = addr
 
     '''

app/src/messages.py

@@ -74,8 +74,9 @@ class Message(metaclass=IterRegistry):
     _registry = []
     new_stat_data = {}
 
-    def __init__(self):
+    def __init__(self, server_side: bool):
         self._registry.append(weakref.ref(self))
+        self.server_side = server_side
         self.header_valid = False
         self.header_len = 0
         self.data_len = 0