Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Enabling Prox to be compatible with Titanium Cloud

    Change-Id: I65e8b2d1cea2a1edfa738671e460b6a0170d3363
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 9e4d303..71a854f 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 9e4d303ca87c498ec5aef9d37f3c6f556eeddaae
+Subproject commit 71a854fb279a807e9cde9a7afa3a75d843bd69ed