Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Use old functest container for armband CI runs"
  - Use old functest container for armband CI runs

    Functest Alpine not supported yet for aarch64 architecture.
    Task for Armband project but until support could be done, the
    traditionnal docker shall be used for armband tests

    usage of alpine leads to errors [1]

    [1]: https://build.opnfv.org/ci/view/functest/job/functest-fuel-armband-baremetal-daily-master/214/console

    Change-Id: I48e05a0c7cd97989784fd97348bd331425c4877e
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a66aea9..fedbb1d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a66aea98afa71751ed6b43673ec292a3a5070014
+Subproject commit fedbb1d10cbb3f6074773833261a70a26238558c