Update git submodules

Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to a446733c9918cb264585ddc35b5e11bf3500bdf8
  - Cleanup POLICY-SDK-APP CheckPDP

    Fixed sonar issues and added a small amount of code coverage.

    CheckPDP was renamed to comply with 2 consecutive capital letters. Various
    sonar issues done.
    Very difficult to get coverage on remaining area - over 82% anyway.

    RESTfulPAPEngine was updated to use the new renamed class and methods.
    Sonar issues were taken care of for the most part and added some coverage
    by consolidating the JUnit tests.

    Added in assertj as we will utilize that more throughout the repo.

    Issue-ID: POLICY-2133
    Change-Id: Id0a9b050ebe373e155878699366d78df71bd0554
    Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>