Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 2b35371701a95217af9dd0641b978fe3886c39f4
  - Images build for samplevnf repo

    Add docker image build for samplevnf repository (rapid testing).

    Signed-off-by: Yury Kylulin <yury.kylulin@intel.com>
    Signed-off-by: Luc Provoost <luc.provoost@intel.com>
    Change-Id: Ic21bfe217fa75e460237514779543e1ae0cdd037

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 80212a1..2b35371 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 80212a14b081b32e06181ee55fcfa6820c6d09f4
+Subproject commit 2b35371701a95217af9dd0641b978fe3886c39f4