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

diff --git a/docs/submodules/multicloud/k8s.git b/docs/submodules/multicloud/k8s.git
index 728875c..967ff89 160000 (submodule)
--- a/docs/submodules/multicloud/k8s.git
+++ b/docs/submodules/multicloud/k8s.git
@@ -1 +1 @@
-Subproject commit 728875c2f904aa20c826565d21bbfd1de750cd75
+Subproject commit 967ff89e7dd42a374e5313447e92489bf27ac2d0