Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 1827d9c464e55037d4de159ea8461fd660cd37fa
  - Merge "prepare-docker-dind: make docker start optional"
  - prepare-docker-dind: make docker start optional

    This change makes it possible to disable docker start after
    prepare-docker-dind role executes.
    Needed for docker role that wants to start docker by itself.
    Note that the docker role also tries to install docker by itself, and
    prepare-docker-dind does the same.
    The reason is that it makes it possible to fix the version of installed docker.

    Change-Id: I7487bc46b316c0e6c782b22d8e24afea35c3c2d5
    Issue-ID: OOM-1863
    Signed-off-by: Michal Zegan <m.zegan@samsung.com>