Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to b6584466e5aff8904241d8107baa722788a8e6a8
  - Merge "[COMMON] add pre upgrade script for mariadb-galera"
  - [COMMON] add pre upgrade script for mariadb-galera

    When upgrading from a version to another, it may be impossible to do it
    "simply" because of changes in immutable properties of statefulsets. We
    change that here by creating a temporary deployment which will hold the
    whole databases during the time the old statefulset gets destroyed and
    the new one gets created.

    Issue-ID: OOM-2316
    Signed-off-by: tringuyen <tri.nguyen@tatacommunications.com>
    Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
    Change-Id: I318d72830d5002f50597e23e0753e292f8b47c53