Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to ab855f16727d3d69c3b97066997283f47ef9ae1c
  - Merge "[DCAEGEN2][bootstrap] Use common secret template for postgres credentials"
  - [DCAEGEN2][bootstrap] Use common secret template for postgres credentials

    Even through we use common secret template both passwords are still
    hardcoded in common postgres chart but this will be removed as a final
    step just like we did for mariadb-galera.

    Issue-ID: OOM-2250
    Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
    Change-Id: Icaa5334d6ebad4fbce23ed4f59b74448c02783cf