[Telemetry] Move from telemetry WaitFor to py_utils WaitFor

telemetry/telemetry/internal/forwarders/cros_forwarder.py

Index: telemetry/telemetry/internal/forwarders/cros_forwarder.py
diff --git a/telemetry/telemetry/internal/forwarders/cros_forwarder.py b/telemetry/telemetry/internal/forwarders/cros_forwarder.py
index 86c5a7aa654168b9486d8159aa39ad155e6f6a3b..4316954559177e6428cc5584d4359be3ea1fd13a 100644
--- a/telemetry/telemetry/internal/forwarders/cros_forwarder.py
+++ b/telemetry/telemetry/internal/forwarders/cros_forwarder.py
@@ -5,10 +5,11 @@
 import logging
 import subprocess
 
-from telemetry.core import util
 from telemetry.internal import forwarders
 from telemetry.internal.forwarders import do_nothing_forwarder
 
+import py_utils
+
 
 class CrOsForwarderFactory(forwarders.ForwarderFactory):
 
@@ -37,7 +38,7 @@ class CrOsSshForwarder(forwarders.Forwarder):
         stderr=subprocess.PIPE,
         stdin=subprocess.PIPE,
         shell=False)
-    util.WaitFor(
+    py_utils.WaitFor(
         lambda: self._cri.IsHTTPServerRunningOnPort(self.host_port), 60)
     logging.debug('Server started on %s:%d', self.host_ip, self.host_port)