Update git submodules

* Update docs/submodules/releng from branch 'master'
  to c645a6fdbe64d4eddf270fb141d876e12e3a1d27
  - Install job dependencies

    Change-Id: I18c1ad3d87224a295ab84cfda06c30454a4bbf82
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ca06ec4..c645a6f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ca06ec4619461ac53ad3e8b783a160bfed95c273
+Subproject commit c645a6fdbe64d4eddf270fb141d876e12e3a1d27