Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to acf41fcb3b1cc3e2746c6171efc6389b1fc19377
  - Merge "Provide idempotent multus plugin configuration"
  - Provide idempotent multus plugin configuration

    Blockinfile task overrides marker section in order to provide
    valid json content in file. Because of this, generated block is
    added each time this playbook is run. This makes CNI config file
    contain malformed content when launched more than once.

    Issue-ID: MULTICLOUD-676

    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: If1c98414be4fb3a5b6c1c63fada0bd934448f040