Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 569c3103f4343017a535e46426cbdcd51ad54e61
  - Merge changes Iee382756,I473f022c

    * changes:
      Allow overriding docker version in prepare-docker-dind
      Specify source ip for rancher agent

  - Allow overriding docker version in prepare-docker-dind

    This change allows overriding of docker version to be installed
    when calling prepare-docker-dind role.
    It also enables downgrading, allowing the
    given version to be taken into account. Previously
    the specified version was completely ignored.

    Change-Id: Iee3827564f130498e9fad69ddea55278346b7cfe
    Issue-ID: OOM-1906
    Signed-off-by: Michal Zegan <m.zegan@samsung.com>
  - Specify source ip for rancher agent

    This change explicitly sets cluster_ip as rancher agent source ip.
    This avoids eventual problems with ip autodetection, especially that
    we know the correct ip.

    Change-Id: I473f022c56301cefeb98ccb5bb94d78e7ac491a7
    Issue-ID: OOM-1906
    Signed-off-by: Michal Zegan <m.zegan@samsung.com>