Update git submodules

* Update docs/submodules/nfvbench from branch 'master'
  - Add tag to docker build

    Change-Id: I1f2d3c163776867aa7f9f58db9292506cd383066
    Signed-off-by: ahothan <ahothan@cisco.com>

diff --git a/docs/submodules/nfvbench b/docs/submodules/nfvbench
index 4e74e93..078f4bb 160000 (submodule)
--- a/docs/submodules/nfvbench
+++ b/docs/submodules/nfvbench
@@ -1 +1 @@
-Subproject commit 4e74e931fb22017abffbe0c4dbed668d5be14e54
+Subproject commit 078f4bba85b5b873bb27dc48025892a7135ea61e