Update git submodules

* Update docs/submodules/aaf/certservice.git from branch 'master'
  to b6b482e71132f0fdf478326e26756aa119749858
  - Add tests to HttpClient
    
    Issue-ID: AAF-996
    Signed-off-by: Tomasz Wrobel <tomasz.wrobel@nokia.com>
    Change-Id: I2d8883552421d055622d5d9ca55b437647c36da4
    
1 file changed