Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - vACL: changes for gateway packet forwarding

    JIRA: SAMPLEVNF-60

    vACL changes to support gateway packet forwarding.

    Change-Id: I1435254e4f18bc26bf2b37be2e3ed2df0fb29153
    Signed-off-by: Anand B Jyoti <anand.b.jyoti@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 9a780cc..3ccd603 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 9a780cc221d28a0302555b89dd309087032b9e39
+Subproject commit 3ccd603c08cc0614ab4fe1c77bf15072ab3582b7