coredevice/comm_tcp: disable socket timeout after connect

Reads may block indefinitely.

artiq/coredevice/comm_tcp.py

@@ -33,6 +33,7 @@ class Comm(CommGeneric):
         if hasattr(self, "socket"):
             return
         self.socket = socket.create_connection((self.host, self.port), 5.0)
+        self.socket.settimeout(None)
         set_keepalive(self.socket, 3, 2, 3)
         logger.debug("connected to host %s on port %d", self.host, self.port)
         self.write(b"ARTIQ coredev\n")