Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to 7f9b4eeaf8d19d04bc53647a4abfd174ae233a6d
  - Release engine 1.6.1 docker
    
    Issue-ID: POLICY-2378
    Change-Id: I81ecd9eb4e26d4e51b52b4fd4dc7663555468444
    Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
    
1 file changed