Update git submodules

* Update docs/submodules/aaf/certservice.git from branch 'master'
  to 628ed81f0e56f7163b08b57a8d54833b646239d5
  - Refactor CSR model to be POJO
    
    Issue-ID: AAF-997
    Signed-off-by: Bartosz Gardziejewski <bartosz.gardziejewski@nokia.com>
    Change-Id: Ia06dd580a64e56dcf1d8bf5f3db6fe6394cdb1c8
    
diff --git a/docs/submodules/aaf/certservice.git b/docs/submodules/aaf/certservice.git
index 9bc693f..628ed81 160000
--- a/docs/submodules/aaf/certservice.git
+++ b/docs/submodules/aaf/certservice.git
@@ -1 +1 @@
-Subproject commit 9bc693f778fd64a9b716061fce3500398e95ef5a
+Subproject commit 628ed81f0e56f7163b08b57a8d54833b646239d5