Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 0766872ba98dc6c46bbe2cfac085bb090b279489
  - Add shell extension to deploy

    It fixes the previous commit [1]

    [1] https://gerrit.opnfv.org/gerrit/c/releng/+/68503/

    Change-Id: If2f936640dec9ff7bb8e167bfc961b02b9587bbf
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9ee2a90..0766872 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9ee2a90a37708254f9089c0d809f1e11164da8fd
+Subproject commit 0766872ba98dc6c46bbe2cfac085bb090b279489