[Telemetry] Move discover to common/py_utils

telemetry/telemetry/core/platform.py

Index: telemetry/telemetry/core/platform.py
diff --git a/telemetry/telemetry/core/platform.py b/telemetry/telemetry/core/platform.py
index 28fe5f1cef3cedd09bc295c09847124d19b96840..39f151b9fac08e33285a359b3ce73a8b14bcce54 100644
--- a/telemetry/telemetry/core/platform.py
+++ b/telemetry/telemetry/core/platform.py
@@ -5,7 +5,6 @@ import logging as real_logging
 import os
 import sys
 
-from telemetry.core import discover
 from telemetry.core import local_server
 from telemetry.core import memory_cache_http_server
 from telemetry.core import network_controller
@@ -14,6 +13,8 @@ from telemetry.core import util
 from telemetry.internal.platform import (platform_backend as
                                          platform_backend_module)
 
+from py_utils import discover
+
 _host_platform = None
 # Remote platform is a dictionary from device ids to remote platform instances.
 _remote_platforms = {}