[Telemetry] Move discover to common/py_utils

common/py_utils/py_utils/discover.py

Index: common/py_utils/py_utils/discover.py
diff --git a/telemetry/telemetry/core/discover.py b/common/py_utils/py_utils/discover.py
similarity index 96%
copy from telemetry/telemetry/core/discover.py
copy to common/py_utils/py_utils/discover.py
index 7e7e4306ef33c717d0ec88cf14c98761f8ce4c22..a79581795be9ddcb21af480b3f393f6f231bb975 100644
--- a/telemetry/telemetry/core/discover.py
+++ b/common/py_utils/py_utils/discover.py
@@ -157,8 +157,8 @@ def DiscoverClassesInModule(module,
     if not directly_constructable or IsDirectlyConstructable(obj):
       if key_name in classes and index_by_class_name:
         assert classes[key_name] is obj, (
-          'Duplicate key_name with different objs detected: '
-          'key=%s, obj1=%s, obj2=%s' % (key_name, classes[key_name], obj))
+            'Duplicate key_name with different objs detected: '
+            'key=%s, obj1=%s, obj2=%s' % (key_name, classes[key_name], obj))
       else:
         classes[key_name] = obj
 
@@ -182,9 +182,9 @@ def IsDirectlyConstructable(cls):
   return len(args) == len(defaults) + 1
 
 
-_counter = [0]
+_COUNTER = [0]
 
 
 def _GetUniqueModuleName():
-  _counter[0] += 1
-  return "module_" + str(_counter[0])
+  _COUNTER[0] += 1
+  return "module_" + str(_COUNTER[0])