[src/ptf update]: Submodule update (#652)

pavel-shirshov · web-flow · commit 01a716cce24a · 2017-05-31T10:48:00.000-07:00
* Update ptf submodule with ptf_nn_agent fixes
diff --git a/src/ptf b/src/ptf
@@ -1 +1 @@
-Subproject commit f9b910d9fa5d393a90a1b99c77e7e1b5641a22c9
+Subproject commit aac6efd0a78bf51f63727e7a13dc79f91f13686e
