Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to bf11d96ff6d9908bf04335a66d0e092a736d4561
  - Merge changes from topic "rke-support"

    * changes:
      Add setup for kubectl and helm
      Add support for RKE kubernetes implementation

  - Add setup for kubectl and helm

    the kubeconfig is copied from the cluster config directory to ~/.kube/config.
    Also, the playbook runs kubectl and helm roles to install tools.
    Change-Id: I29ee98f6502bbb7923b1ae6812dd642ca206dbce
    Issue-ID: OOM-1778
    Signed-off-by: Petr Ospalý <p.ospaly@partner.samsung.com>
    Signed-off-by: Michal Zegan <m.zegan@samsung.com>
  - Add support for RKE kubernetes implementation

    Added a new playbook rke.yml and role rke which uses rancher RKE:
    https://github.com/rancher/rke

    It's an implementation of the kubernetes from rancher.com folks
    and it is an alternative to the official kubernetes tool: kubeadm.

    NOTE: Rancher has a notion of a 'control plane' which cannot run with
    etcd on all nodes in a multi-node setup. Control-plane node is the
    first kubernetes node from the inventory (as of now).

    Change-Id: I0bf669442a5183efa20d44fb1cac823e7ce54348
    Issue-ID: OOM-1778
    Signed-off-by: Petr Ospalý <p.ospaly@partner.samsung.com>
    Signed-off-by: Michal Zegan <m.zegan@samsung.com>