Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 1b8bee840af30f67fcdc0d45ef9334f0461ca1c7
  - Merge "Enable self-cleanup after testing vcFW deployment"
  - Enable self-cleanup after testing vcFW deployment

    integration_vcFW.sh has been updated to clean k8s
    from testsuite leftovers after it finishes when passed
    optional '--cleanup' flag. Without it, script will
    preserve created vcFW environment for debug purposes.

    Issue-ID: MULTICLOUD-708
    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: Ia6d78f1e3e2ac81e8ff7385d563e9bf1b1479026