Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 7ff99668b98aae1210f72e84fcc1305814563600
  - Fix helm installation conflict

    Kubespray installs helm client on kubernetes master. The same client
    has to be installed on host running installation playbooks. In single
    node scenario, local host already has helm client installed by
    kubespray, thus leading to conflict due to way of provisioning.
    This helm installation has been moved to global configure playbook, as
    well as corrected, not to fail on single host deployments.

    Issue-ID: MULTICLOUD-690

    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: I1ef779ed0f2fde82758ce9e229c3f5bb015b2aeb