Add priority groups to local paths in the dependency manager.

tools/telemetry/catapult_base/dependency_manager/dependency_manager.py

Index: tools/telemetry/catapult_base/dependency_manager/dependency_manager.py
diff --git a/tools/telemetry/catapult_base/dependency_manager/dependency_manager.py b/tools/telemetry/catapult_base/dependency_manager/dependency_manager.py
index 9e1de84fcfe70e92f847e353ea4aa405e467fba5..3dfb3366595d18d98dd2add3ae5a59b9be2fdf28 100644
--- a/tools/telemetry/catapult_base/dependency_manager/dependency_manager.py
+++ b/tools/telemetry/catapult_base/dependency_manager/dependency_manager.py
@@ -214,10 +214,20 @@ class DependencyManager(object):
     Returns: A path to a local file, or None if not found.
     """
     if dependency_info:
-      paths = dependency_info.local_paths
-      for local_path in paths:
-        if os.path.exists(local_path):
-          return local_path
+      local_paths = dependency_info.local_paths
+      found_path = None
+      for priority_group in local_paths:
+        # A list of paths in local_paths implies the same priority, so return
+        # the most recently modified one.
+        found_path_mtime = 0
+        for path in priority_group:
+          if os.path.exists(path):
+            mtime = os.stat(path).st_mtime

[eakuefner, 2015/10/09 16:29:17]

mtime = os.path.getmtime(path)

+            if mtime > found_path_mtime:
+              found_path = path
+              found_path_mtime = mtime
+        if found_path:
+          return found_path
     return None
 
   @staticmethod