Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - 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 be23f20..ac0dfab 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit be23f20bcddd63dec506515c1518c995b0f8aa86
+Subproject commit ac0dfab0b48c26965d06a1817b81c069cdf8ba46