Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Fix compilation issue with older gcc

    Change-Id: Ib7f67bff93ce531f66be31c3fbd63ecbb33a46d8
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 2a738a1..9dae4a6 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 2a738a1538bec699534c17d1801bd33f20dafda6
+Subproject commit 9dae4a62e3405311151e164d25e6d93d6a707726