[Telemetry] Move from telemetry WaitFor to py_utils WaitFor

telemetry/telemetry/internal/forwarders/do_nothing_forwarder_unittest.py

Index: telemetry/telemetry/internal/forwarders/do_nothing_forwarder_unittest.py
diff --git a/telemetry/telemetry/internal/forwarders/do_nothing_forwarder_unittest.py b/telemetry/telemetry/internal/forwarders/do_nothing_forwarder_unittest.py
index 51ebe05d73521b02ce19cc8b6207ed8f73c4d8f9..7a17c870cd8a0a2e610f6a58003fead9e854a9d8 100644
--- a/telemetry/telemetry/internal/forwarders/do_nothing_forwarder_unittest.py
+++ b/telemetry/telemetry/internal/forwarders/do_nothing_forwarder_unittest.py
@@ -4,10 +4,11 @@
 
 import unittest
 
-from telemetry.core import exceptions
 from telemetry.internal import forwarders
 from telemetry.internal.forwarders import do_nothing_forwarder
 
+import py_utils
+
 
 class TestDoNothingForwarder(do_nothing_forwarder.DoNothingForwarder):
   """Override _WaitForConnect to avoid actual socket connection."""
@@ -24,7 +25,7 @@ class TestErrorDoNothingForwarder(do_nothing_forwarder.DoNothingForwarder):
   """Simulate a connection error."""
 
   def _WaitForConnectionEstablished(self, address, timeout):
-    raise exceptions.TimeoutException
+    raise py_utils.TimeoutException
 
 
 class CheckPortPairsTest(unittest.TestCase):