Update git submodules

* Update docs/submodules/nfvbench from branch 'master'
  - Fix module path for cleanup script

    Change-Id: I8035805c02712f9b1c38aded44e7590cd7b670ea
    Signed-off-by: ahothan <ahothan@cisco.com>

diff --git a/docs/submodules/nfvbench b/docs/submodules/nfvbench
index 0549282..ba423e2 160000 (submodule)
--- a/docs/submodules/nfvbench
+++ b/docs/submodules/nfvbench
@@ -1 +1 @@
-Subproject commit 054928298b635893db73e2e827605d4a3896969e
+Subproject commit ba423e2c7f322871507835341d8265074d747781