Update git submodules

* Update docs/submodules/aaf/certservice.git from branch 'master'
  to 25d1822ef48ead8672d9ded900a475c427290037
  - Improve code coverage for CertServiceClient
    
    Issue-ID: AAF-996
    
    Signed-off-by: pwielebs <piotr.wielebski@nokia.com>
    Change-Id: I2d9c5143446be73e3576f006359e734f5f2300d4
    
1 file changed