Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 57ba15140f909434bd309a447c53eb6db4147f8f
  - Merge "Bring in all the other helper code"
  - Bring in all the other helper code

    Bring in all the helper functions added for end to end
    integration. This allows the api level upload of helm charts,
    profiles and also instantiation of said helm charts.
    P3: Plugin index is based on lowercase kind name
        whereas the map contains the correct case for kind.
        Convert to lower case before loading the plugin.
    Changes after rebasing on the new folder structure.
    Rebasing over the new folder structure
    P8: Add unit tests for Resolve function
        Fix the integration tests for createvnf
        I had to add a huge blob of base64 encoded data
        based on the profile and sample helm chart to test
        the flow.
    P12: Update the integration test with the rb_profile_id parameter

    Issue-ID: MULTICLOUD-291
    Change-Id: If04c41cb185074989ab6c96557958140c43e456d
    Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>