Update git submodules

* Update docs/submodules/nfvbench from branch 'master'
  - [NFVBENCH-62] Add support for non-openstack environments

    Add Unit test to validate non-openstack with dummy traffic gen

    Change-Id: I359ddb7d43169f706d8262842af975d5b4675a3a
    Signed-off-by: ahothan <ahothan@cisco.com>

diff --git a/docs/submodules/nfvbench b/docs/submodules/nfvbench
index b481ad4..02c8ed9 160000 (submodule)
--- a/docs/submodules/nfvbench
+++ b/docs/submodules/nfvbench
@@ -1 +1 @@
-Subproject commit b481ad4a6c6b98cac760b12e4190f9540869e673
+Subproject commit 02c8ed97e27b6e417945d27d4d3c2ab8e7dbfa7e