Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Adding Farser  preliminary documentation

    Change-Id: I3bbd7897deb6e452068c07ef68d395affa4a4b50
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 167e6d1..883e960 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 167e6d113d61a4a75812d0df71843b0ab8b88784
+Subproject commit 883e96028c8dcfe9ceea7911b028953b4776b970