Update git submodules

Update git submodules

* Update docs/submodules/aaf/certservice.git from branch 'master'
  to 475767191e107a1c385d5b031ff88ab8034278e4
  - Merge "Improve paths validation and creation in certServiceClient, improve coverage"
  - Improve paths validation and creation in certServiceClient, improve coverage

    Add tests for path validation
    Add tests for CsrConfigurationFactory
    Ensure path from env can end with "/"
    Ensure path built in file creator is not dependent on representation of root path

    Issue-ID: AAF-996
    Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
    Change-Id: I3d6a7f534d49ff64177917989727a7330e3f6869