[Telemetry] Move from telemetry WaitFor to py_utils WaitFor

telemetry/telemetry/internal/platform/android_device.py

Index: telemetry/telemetry/internal/platform/android_device.py
diff --git a/telemetry/telemetry/internal/platform/android_device.py b/telemetry/telemetry/internal/platform/android_device.py
index 79345a6cbd9139df29acd7c29238c1d576cbecf3..286bd03f53802799ebbb66ef8d893761dae2ba73 100644
--- a/telemetry/telemetry/internal/platform/android_device.py
+++ b/telemetry/telemetry/internal/platform/android_device.py
@@ -6,7 +6,6 @@ import logging
 import os
 import subprocess
 
-from telemetry.core import util
 from telemetry.internal.platform import cros_device
 from telemetry.internal.platform import device
 from telemetry.internal.platform.profiler import monsoon
@@ -16,6 +15,7 @@ from devil.android import device_errors
 from devil.android import device_utils
 from devil.android.sdk import adb_wrapper
 
+import py_utils
 
 def _KillStrayADBProcesses():
   p = subprocess.Popen(['killall', 'adb'])
@@ -97,7 +97,7 @@ The Monsoon's power output has been enabled. Please now ensure that:
 
 Waiting for device...
 """)
-      util.WaitFor(_ListSerialsOfHealthyOnlineDevices(blacklist), 600)
+      py_utils.WaitFor(_ListSerialsOfHealthyOnlineDevices(blacklist), 600)
       device_serials = _ListSerialsOfHealthyOnlineDevices(blacklist)
     except IOError:
       return []