Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 70f54e61d7081507760a8d876e13b2088f9ff58f
  - Merge changes Id235f454,I0c6dd5e4

    * changes:
      Correct plugin_edgex testcase
      Provide wrapper functions for issuing k8splugin API calls

  - Correct plugin_edgex testcase

    Plugin_edgex.sh script hasn't been updated to few changes
    that happened in k8splugin API and CSAR definitions. This
    commit rewrites previous test scenario to be up to date with
    current plugin state.

    Issue-ID: MULTICLOUD-686

    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: Id235f4549e10f57451bf2b6195df8c95230e1c7e

  - Provide wrapper functions for issuing k8splugin API calls

    In plugin.sh and plugin_edgex.sh test scenarios, there are
    executed many curl calls to API endpoint. As curl's default
    behavior for handling 4xx and 5xx status code is not perfect,
    wrapper functions have been created to easily ensure correctness
    of issued API call.

    Issue-ID: MULTICLOUD-686

    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: I0c6dd5e4f896972245a6fa6c8c2a10d8df8ec406