Refactor interop tests and factories

- Add `close` and `disconnect` in `Host`
- Add `close` and `close_peer` in `Network`
- Change `IListener.close` to async, to await for server's closing
- Add factories for security transports, and modify `HostFactory`

libp2p/network/network_interface.py

@@ -70,3 +70,11 @@ class INetwork(ABC):
         :param notifee: object implementing Notifee interface
         :return: true if notifee registered successfully, false otherwise
         """
+
+    @abstractmethod
+    async def close(self) -> None:
+        pass
+
+    @abstractmethod
+    async def close_peer(self, peer_id: ID) -> None:
+        pass

libp2p/network/swarm.py

@@ -264,12 +264,24 @@ class Swarm(INetwork):
     def add_router(self, router: IPeerRouting) -> None:
         self.router = router
 
-    # TODO: `tear_down`
-    async def tear_down(self) -> None:
-        # Reference: https://github.com/libp2p/go-libp2p-swarm/blob/8be680aef8dea0a4497283f2f98470c2aeae6b65/swarm.go#L118  # noqa: E501
-        pass
+    async def close(self) -> None:
+        # TODO: Prevent from new listeners and conns being added.
+        #   Reference: https://github.com/libp2p/go-libp2p-swarm/blob/8be680aef8dea0a4497283f2f98470c2aeae6b65/swarm.go#L124-L134  # noqa: E501
 
-    # TODO: `disconnect`?
+        # Close listeners
+        await asyncio.gather(
+            *[listener.close() for listener in self.listeners.values()]
+        )
+
+        # Close connections
+        await asyncio.gather(
+            *[connection.close() for connection in self.connections.values()]
+        )
+
+    async def close_peer(self, peer_id: ID) -> None:
+        connection = self.connections[peer_id]
+        del self.connections[peer_id]
+        await connection.close()
 
 
 def create_generic_protocol_handler(swarm: Swarm) -> GenericProtocolHandlerFn: