revert to daemon for interface code

lib/interface.py

@@ -67,6 +67,7 @@ class TcpConnection(threading.Thread, util.PrintError):
         self.host = str(self.host)
         self.port = int(self.port)
         self.use_ssl = (self.protocol == 's')
+        self.daemon = True
 
     def diagnostic_name(self):
         return self.host