Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - [common] fixing compiler warnings

    patch fixes some compiler warnings

    Change-Id: If1f96b23243d556c69ebd390a4fd3313bc50bb57
    Signed-off-by: Vishwesh M Rudramuni <vishwesh.m.rudramuni@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index e0fe155..3bd0ffd 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit e0fe1551eea78f6504f5ed4bb36d9dd22a43fffc
+Subproject commit 3bd0ffd52aff6fc44f55445f22de46f1cd7d5cbd