Update git submodules

* Update docs/submodules/releng from branch 'master'
  to c0222aae58ce49468f7b9ea9a4527574f364656b
  - Enable refstack_[platform,compute] in airship gates

    They are now skipped by Functest if NO_TENANT_NETWORK.

    Change-Id: I764004bfefff99f43850dc4897003d4731a9d2b9
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d836d1f..c0222aa 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d836d1f1bccbb8681aa54f5137e85a2f71391595
+Subproject commit c0222aae58ce49468f7b9ea9a4527574f364656b