Update git submodules

Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to 9f774daf0c3e317c9542c9fe4108772006b267a9
  - Merge "Allow storing database password in environment variables"
  - Allow storing database password in environment variables

    This patch allows to store and get database password from
    environment variables. This is needed if we want to send those
    variables by helm secrets.

    Issue-ID: OOM-2287
    Change-Id: I041c3e4dd3b9042b2b6c2b34afc22867bab81b22
    Signed-off-by: Dominik Mizyn <d.mizyn@samsung.com>