Moved upload hooks to use python3 by default.

Bug: None
Change-Id: If117b4c753c7352bf2eae1a52ffaf15c806c373f
Tests: This upload
diff --git a/acts/framework/tests/libs/ota/ota_tools/ota_tool_factory_test.py b/acts/framework/tests/libs/ota/ota_tools/ota_tool_factory_test.py
index 5b9839e..9e15177 100644
--- a/acts/framework/tests/libs/ota/ota_tools/ota_tool_factory_test.py
+++ b/acts/framework/tests/libs/ota/ota_tools/ota_tool_factory_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3.4
+#!/usr/bin/env python3
 #
 #   Copyright 2017 - The Android Open Source Project
 #