Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 517e4576afcdd6b59a3b552ea394901c2003ca0a
  - Merge "Make 'prepare-docker' install proper docker-ce version"
  - Make 'prepare-docker' install proper docker-ce version

    Docker-ce version should be aligned with Docker release
    installed on target platform
    (see build/creating_data/create-rhel-repo.sh)

    This patch also optimizes package installation process
    in Molecule tests.

    Change-Id: I3f0cb7cd36a3f91027b2be43a925e54167d9c6d0
    Issue-ID: OOM-1815
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>