Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to 831a26adc7fa94b5a9e402f9a4f248c9431965da
  - Merge "[COMMON] Remove hardcoded mariadb-galera password"
  - [COMMON] Remove hardcoded mariadb-galera password

    The time has come! All ONAP charts use now common secret template at
    least for the mariadb-galera root password (and most of them also for
    user part). This means that it should be now safe to remove hardcoded
    mariadb-galera root password and depend on common secret template to
    generate it for every deployment.

    No more secretpassword!:D

    Issue-ID: OOM-2342
    Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
    Change-Id: Ib9d8bbcc45bfd85a4d762c716c03dba23d901009