Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - vFW: changes for gateway packet forwarding

    JIRA: SAMPLEVNF-59

    Changes to support gateway packet forwarding to vFW.

    Change-Id: Ie9164b092f6864cfcdb02e7b325c4e8796a7e422
    Signed-off-by: Anand B Jyoti <anand.b.jyoti@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 3ec8961..2f85c34 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 3ec896179c547d54a18b40494a2871d7e328c0bf
+Subproject commit 2f85c34421d730cf990e6a03be8c4b40be7e144d