Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 0fd6ec7e4956b03858d3d4351dcda37662b63d1d
  - Add v2 cluster registration api to k8s orchestrator

    Adds orchestrator API support for creating
    cluster-providers, registering clusters and their
    kubeconfig, adding labels to cluster and key value
    paisr to clusters.
    See: https://wiki.onap.org/display/DW/V2+API+Specification#V2APISpecification-ClusterRegistrationAPI

    Issue-ID: MULTICLOUD-922
    Signed-off-by: Eric Multanen <eric.w.multanen@intel.com>
    Change-Id: I775a308e9ffb19acf65cb0e5752705998bc5b659