Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge changes from topic 'fuel-armband-deploy-sync'

    * changes:
      fuel, armband: Remove/disable artifact download
      fuel, armband: Remove build jobs and scripts
      fuel, armband: Drop armband-deploy.sh
      fuel, armband: Sync deploy scripts, cleanup

  - fuel, armband: Remove/disable artifact download

    Armband no longer requires any artifact before starting a deployment.
    Fuel (master and stable/E) no longer requires the artifact either,
    but since there are some stable/danube deploy jobs on ZTE PODs, we
    will hold off removing <fuel-download-artifact.sh> for a while.

    Deprecation warning: fuel-download-artifact.sh will be removed later.

    JIRA: ARMBAND-295

    Change-Id: I3b26733a1120306879eff83b9fac3390b3f5c7b8
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - fuel, armband: Remove build jobs and scripts

    While at it, cleanup obsolete parameters specific to build ops.

    JIRA: FUEL-277
    JIRA: FUEL-278

    Change-Id: Id45dfe6855c95c425ac9aa771519d450ba9da3b5
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - fuel, armband: Drop armband-deploy.sh

    Since armband-deploy.sh is merely a clone of fuel-deploy.sh, which
    we recently synced, drop armband-deploy.sh in favor of an universal
    fuel-deploy.sh, which will handle deploys for both projects.

    Change-Id: I653b4e67d9246951a284671e0cf559394661a1ad
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - fuel, armband: Sync deploy scripts, cleanup

    Run shellcheck on touched files, fix minor warnings.
    Prepare for upcoming changes:
    - ISO artifact will be obsoleted (later);
    - Fuel and Armband should use the same deploy script;

    Fuel:
    - rename securedlab local copy to lab-config;

    Armband:
    - drop deploy cache, Danube jobs can work without it, master/next
      jobs no longer use it;
    - move TMPDIR to $HOME (was in $WORKSPACE), so it's persistent;

    Change-Id: I9f8c47f9ca50de3c53c62ca6a08df0cc3a73abd3
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a853431..444ec63 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a853431b3c5970b3bed138966d537714bb4bbd1d
+Subproject commit 444ec6314f41400bb4e1cb8dfd65f66083cb794e