Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - Fix the cgnapt pipeline stat issues

    Change-Id: I58d4a1b6c47fa204a8af67c725b22f797ec19755
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index c65d2e7..f0b9e18 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit c65d2e761955affbdb76fc31ebb188ac492c31ca
+Subproject commit f0b9e1845fa02690492a8a37069a633f15eafdf4