Update git submodules

* Update docs/submodules/policy/parent.git from branch 'master'
  to 2e478fa17f69cb97562a790e433c5873ed4502e9
  - Corrections in vCPE tutorial
    
    Issue-ID: POLICY-1851
    Signed-off-by: jhh <jorge.hernandez-herrero@att.com>
    Change-Id: Idc72df51ce713528284fe0834b6673d700a74042
    
1 file changed