Update git submodules

* Update docs/submodules/releng from branch 'master'
  to b3ddb781e5f0e7cf76b101c12da028578034d96c
  - Clean Airship Jenkins Jobs

    Airship is being archived (see last TSC)

    Change-Id: I06a38f77594c72678c4b1a33c9aae944158da5b0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4521a0a..b3ddb78 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4521a0abf54375f59bebab5648991b5ef86d549b
+Subproject commit b3ddb781e5f0e7cf76b101c12da028578034d96c