Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to 27d1d484fd22a1e6a87a79b74ae8e721f57c5a48
  - Add release 1.5.1 file
    
    Issue-ID: POLICY-1953
    Signed-off-by: jhh <jorge.hernandez-herrero@att.com>
    Change-Id: Ief5e6342b4f24cf594b3bc6456be8a526c214bb8
    
1 file changed