Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 502b61039dbdc9089768a49b87163e654d8cbfb7
  - Merge "Resolve the helm templates"
  - Resolve the helm templates

    Resolving the helm templates for each of the apps
    in the compositeApp by utilizing the helm libraries
    and thus getting the sorted templates with all values
    rendered.
    This is a subtask of adding instantiation APIs.

    Issue-ID: MULTICLOUD-1041
    Signed-off-by: Rajamohan Raj <rajamohan.raj@intel.com>
    Change-Id: Id4fddda69b5276b2409d835723b11367400ab6ea