Update git submodules

* Update docs/submodules/releng from branch 'master'
  to b5e9c78df69487adcf1e48cffe1d0034fffc688e
  - Run one single ims at glance

    Change-Id: I66339d363735522e57cb309d31e0a8f77fcc561f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 47390f8..b5e9c78 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 47390f81d7138b5ef9bba50e6cfbc1e65e0c37cd
+Subproject commit b5e9c78df69487adcf1e48cffe1d0034fffc688e