Fix Transport, DatagramTransport mockup issues.

tests/dht_mocks.py

@@ -61,7 +61,6 @@ def mock_network_loop(loop: asyncio.AbstractEventLoop,
         dht_network[from_addr] = protocol
         return transport, protocol
 
-    with mock.patch('socket.socket') as mock_socket:
     mock_sock = mock.Mock(spec=socket.socket)
     mock_sock.setsockopt = lambda *_: None
     mock_sock.bind = lambda *_: None
@@ -71,6 +70,5 @@ def mock_network_loop(loop: asyncio.AbstractEventLoop,
     mock_sock.close = lambda: None
     mock_sock.type = socket.SOCK_DGRAM
     mock_sock.fileno = lambda: 7
-        mock_socket.return_value = mock_sock
     loop.create_datagram_endpoint = create_datagram_endpoint
     yield