Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 73508f2314473fd6cfbef99d86e15833f352ac44
  - Add v1.22 in jjb/releng/releng-release-jobs.yaml

    Change-Id: I6aaaccb8846cca03717ee34ec899dbe3f303d4d0
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7a24c58..73508f2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7a24c585ad868c5a8ff7ab9fc244d99a4f2a53d9
+Subproject commit 73508f2314473fd6cfbef99d86e15833f352ac44