Update git submodules

* Update docs/submodules/aaf/certservice.git from branch 'master'
  to 15b97eff96d424102f1ced9d5bd37616260414a3
  - Merge "CertService local starter"
  - CertService local starter
    
    Issue-ID: AAF-1107
    Signed-off-by: Zebek Bogumil <bogumil.zebek@nokia.com>
    Change-Id: I7742fa622bd8acf4764137d98cad581781487103
    
1 file changed