Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - Fix table issues in release notes

    Change-Id: I0c2accf7e2c1f417b9823a0dfa1f356ff7730a3d
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index bdf826f..e44592e 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit bdf826f13c9b3b3c0d1b8e0028dad653ef69d9fc
+Subproject commit e44592e08dd0a9f6a64586e11374f8e9e6285fa0