Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 967ff89e7dd42a374e5313447e92489bf27ac2d0
  - Merge "Enable random_hostname vagrant-libvirt value"
  - Enable random_hostname vagrant-libvirt value

    This configuration value allows to generate Libvirt instances with
    randomly domain names generated. As result, it's possible to use this
    project in the same server but in different folders at the same time.
    As part of the change, it was necessary to centraliza some Libvirt
    common configurations.

    Change-Id: Ie6adf3f40de7a8cced875b0c899738f9f6449181
    Signed-off-by: Victor Morales <victor.morales@intel.com>
    Issue-ID: MULTICLOUD-301