Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 747a8e202cf5f959206ad1af2bf38f7ea1a6440f
  - Molecule container for running Molecule

    Add own Dockerfile and build script for creating
    customized molecule runner image from Molecule image
    provided by https://quay.io/repository/ansible/molecule.

    Customization enables running of molecule container with
    current host's user to avoid root owned files bloating
    to developer's machine.

    Add wrapper script molecule.sh to utilize custom image
    and suitable for testing offline-installer roles.

    Issue-ID: OOM-1768

    Change-Id: I14ed75decb8fa637c044675543de56f1c0796271
    Signed-off-by: Samuli Silvius <s.silvius@partner.samsung.com>