Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[fuel] deploy: Stop using securedlab for master"
  - [fuel] deploy: Stop using securedlab for master

    Instead of cloning securedlab locally and passing it to Fuel deploy
    script, rely on Pharos git repo, embedded as a git submodule in Fuel.

    Keep old behavior (using securedlab) for stable/{danube,euphrates}.

    Depends-on: Ib04e4fb384568a6efd9e78a080857b663521ae88

    Change-Id: Ie30879292ae04b641257760de69c900a9eb4ef84
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c99860d..28f5465 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c99860d6531ff48dee5f6f3d848314229bca6d77
+Subproject commit 28f546569dbad964b6b1525821b65e22db1b0e3d