Update git submodules

Update git submodules

* Update docs/submodules/aaf/certservice.git from branch 'master'
  to 1e81a4ebe5141878b054e72d000ac0e7f6bc3d71
  - Merge "Added actuator for refreshing configuration"
  - Added actuator for refreshing configuration

    Cloud-config dependency is provided
    Event listener introduced to handle refresh call
    Refresh endpoint exposed
    Fixed docker-compose to start locally and use build images
    Update repositories for docker image and install vim on it

    Issue-ID: AAF-997
    Signed-off-by: Tomasz Golabek <tomasz.golabek@nokia.com>
    Change-Id: Iee005518c901dad7730c5f48c410ec89850f1425