Update git submodules

* Update docs/submodules/releng from branch 'master'
  to a21cb3db6aeb8a34d83bfe3ceaa71f8ff84f15db
  - Merge "Add logics to cover podman deployments"
  - Add logics to cover podman deployments

    Change-Id: I12d6e9814c501ae3b3eec2722d3052e4c1b54baa
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7d6e0d9..a21cb3d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7d6e0d97b57d3beb87d14c2a720079b382271066
+Subproject commit a21cb3db6aeb8a34d83bfe3ceaa71f8ff84f15db