[Telemetry] Move discover to common/py_utils

telemetry/telemetry/value/__init__.py

Index: telemetry/telemetry/value/__init__.py
diff --git a/telemetry/telemetry/value/__init__.py b/telemetry/telemetry/value/__init__.py
index 5b4ad1d0aa1c97f2775cc5658f1bb8b11acb4d15..668ead18522f1796751ed8e933928bcc1b46fda2 100644
--- a/telemetry/telemetry/value/__init__.py
+++ b/telemetry/telemetry/value/__init__.py
@@ -22,9 +22,10 @@ Merge* family of methods for this kind of aggregation.
 """
 import os
 
-from telemetry.core import discover
 from telemetry.core import util
 
+from py_utils import discover
+
 # When converting a Value to its buildbot equivalent, the context in which the
 # value is being interpreted actually affects the conversion. This is insane,
 # but there you have it. There are three contexts in which Values are converted