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>

diff --git a/docs/submodules/policy/engine.git b/docs/submodules/policy/engine.git
index 8f0c052..9f774da 160000 (submodule)
--- a/docs/submodules/policy/engine.git
+++ b/docs/submodules/policy/engine.git
@@ -1 +1 @@
-Subproject commit 8f0c0524afb0ebedf5a11a3b68e4624c8168d716
+Subproject commit 9f774daf0c3e317c9542c9fe4108772006b267a9