Update git submodules

Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to b86c95c99240e8ed0ef91932a70ebed313dbd60c
  - Checkstyle and some coverage

    Address some trailing space from previous review. Mostly this
    was checkstyle issues of naming methods and variables, distance
    from usage, missing javadoc, 120 character spacing.

    Did add a few trivial code coverage tests.

    Issue-ID: POLICY-2133
    Change-Id: I159d1b27429b6bef046092ea3a4045fbd3a1071c
    Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>