Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to 278cb967f83be3ce89d17c225f474ef42698b3c0
  - Bump engine 1.6.3-SNAPSHOT
    
    Issue-ID: POLICY-2378
    Change-Id: Ic374190da660b3c258998ecf131fa57dcb1cb834
    Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
    
1 file changed