Test runner: fix outdated "import discovery"

tools/testrunner/server/work_handler.py

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 16 matching lines @@
 
 
 import os
 import SocketServer
 import stat
 import subprocess
 import threading
 
 from . import compression
 from . import constants
-from . import discovery
 from . import signatures
 from ..network import endpoint
 from ..objects import workpacket
 
 
 class WorkHandler(SocketServer.BaseRequestHandler):
 
   def handle(self):
     rec = compression.Receiver(self.request)
     while not rec.IsDone():
@@ skipping 82 matching lines @@
   def _Call(self, cmd):
     return subprocess.call(cmd, shell=True)
 
 
 class WorkSocketServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
   def __init__(self, daemon):
     address = (daemon.ip, constants.PEER_PORT)
     SocketServer.TCPServer.__init__(self, address, WorkHandler)
     self.job_lock = threading.Lock()
     self.daemon = daemon