Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Merge "update userguide alignment"
  - update userguide alignment

    Change-Id: Id0eb364fdeb7e9b084c247b0875e9de7b599abfb
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 5a498f4..cf99de9 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 5a498f4105384c56198453cc506d7887bf8d585e
+Subproject commit cf99de92f530cbc827774270da2e26fcccbc3565