Update git submodules

* Update docs/submodules/aaf/certservice.git from branch 'master'
  to 776b69d627923138d41b1d893b91495bb71c2c16
  - Merge "Add descrption of usage client container"
  - Add descrption of usage client container
    
    Issue-ID: AAF-996
    Signed-off-by: Tomasz Wrobel <tomasz.wrobel@nokia.com>
    Change-Id: I34cafe8c7ad917a66a251692910d5f6188444c92
    
1 file changed