Update git submodules

Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to a617d3e1dcdcf63c38406e9bdb0e38834befb8d2
  - Bump patch 1.6.1 to fix JUnit issue

    The docker stage job is not succeeded, nor is the sonar
    job. Logging doesn't produce anything useful, so the best
    bet is to fix the order of the tests and hope that fixes the
    problem.

    Regardless must bump the patch to release it again.

    Issue-ID: POLICY-2378
    Change-Id: I01ff47c8deb124e9fd6ffcb37407dc580ecd6b03
    Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>