Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - Remove default section in the createrapid

    Change-Id: Id9c22f92955b64242971ff768a64132451c8350e
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 03f354a..a6c7342 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 03f354aa901aa5d276cc74ff8f5ed39186041c26
+Subproject commit a6c7342b5cf20691bd45e55587deabac8da3a671