Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to 1884ba91333caea194da7aaac0af2afcc9b43a83
  - Update git submodules

    * Update kubernetes/robot from branch 'master'
      to 7ee95b4c8f667dd0506499db17688473309cd91e
      - bump testsuite 1.6.3 for frankfurt RC2

        the delta with 1.6.2 includes minor fixes for
        - 5gbulkpm
        - pnf-registrate

        Please note that these changes are already taken into account in CI
        as xtesting dockers are rebuilt everyday but it is cleaner to execute
        the use cases

        Issue-ID: INT-1553

        Signed-off-by: mrichomme <morgan.richomme@orange.com>
        Change-Id: Ibd41c65d4190421e7c790f7e1f8a754923803757
        Signed-off-by: mrichomme <morgan.richomme@orange.com>