Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to a73b09212b05b546623143f3fb796609177a4055
  - Fix path to images
    
    Relative playbook path breaks
    in aio configuration.
    
    Issue-ID: MULTICLOUD-684
    Signed-off-by: Ritu Sood <ritu.sood@intel.com>
    Change-Id: Id064157d010438dea33500dd0dc200b1c1b0f0d1
    
1 file changed