Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 492c28556906ef83b8fd300ad71003dd7b0c0560
  - nit: make it bash

    Change-Id: Ie8e15455db59ac57cd5dc9552ee575b8a0a8ebab
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a160209..492c285 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a160209d141c36635f10af4db2d03cd97ec8ecdc
+Subproject commit 492c28556906ef83b8fd300ad71003dd7b0c0560