Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Fix all the config files alignment issues

    Change-Id: I087c9a9acf412a99f8425fd65d07db6c3b7a4af7
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index a06bb39..3ce13d6 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit a06bb395ea7ea8110c98546a998d3e7e3016c791
+Subproject commit 3ce13d63855abc7d6221cdd1326c551e49ac81ce