Update git submodules

* Update docs/submodules/nfvbench from branch 'stable/euphrates'
  - Update hw requirements

    Change-Id: I7e403ec5a550804b43c685bdbfd70c8bff7a2d70
    Signed-off-by: ahothan <ahothan@cisco.com>
    (cherry picked from commit 55409f779ba0f05ffca52f6ad31ca5b3575c9b53)

diff --git a/docs/submodules/nfvbench b/docs/submodules/nfvbench
index 15526eb..1a69436 160000 (submodule)
--- a/docs/submodules/nfvbench
+++ b/docs/submodules/nfvbench
@@ -1 +1 @@
-Subproject commit 15526ebdbc5c97e6d26c95e4187ddeeda5cc9d3f
+Subproject commit 1a694362729de72c9703719d587abcb96f0f3f0a