Update git submodules

Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to ad162645e845baae599383a227122bcfffb8d326
  - Merge "JUnit/SONAR/Checkstyle in ONAP-REST"
  - JUnit/SONAR/Checkstyle in ONAP-REST

    Second batch of JPA pojos (B-D), with JUnit added and SONAR/Checkstyle
    issues addressed. In cases where a class name change caused an update in
    another package, the license header on files for those knock on changes
    are not updated.

    Issue-ID: POLICY-2131
    Change-Id: I9466f27ffa606001209ed978be592ae95d1b32c4
    Signed-off-by: liamfallon <liam.fallon@est.tech>