Update git submodules

* Update docs/submodules/aaf/certservice.git from branch 'master'
  to 3731f17fd97677d8c426de15241c1310d0947fcf
  - Merge "Add of logging for certservice-client"
  - Add of logging for certservice-client
    
    Issue-ID: AAF-996
    Signed-off-by: kjaniak <kornel.janiak@nokia.com>
    Change-Id: I8bed44937da32fff863df724adc023f546b5e12e
    
1 file changed