Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - Fix cgnapt status output

    Change-Id: I37ef70ae324e258da16b7bd67baf0e939d88b3ec
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index f0b9e18..e38bfe2 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit f0b9e1845fa02690492a8a37069a633f15eafdf4
+Subproject commit e38bfe2a04a5a37a3420cf44f5702045d9ad473c