Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to 2b6bce7f8db3866133488f0a64f478569494f7b8
  - Merge changes Ia35fac70,I7ffaa3d4,I53e7e4d6

    * changes:
      Update plugin.sh with new helper functions
      Provide connection info for plugin testcase
      Correct k8splugin endpoint configuration in KUD test

  - Update plugin.sh with new helper functions

    Plugin.sh has been refactored to use new wrapper functions as well
    as utilize helm package command for creating resource bundle in
    order to test proper handling of this scenario by plugin

    Issue-ID: MULTICLOUD-686

    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: Ia35fac70153fdb34ba75bfff31f9b2566b986cf1

  - Provide connection info for plugin testcase

    Plugin.sh testcase was unable to instantiate VNF as it was
    missing k8s backend configuration. This configuration is
    now provided before instantiation and torn down on test end.

    Issue-ID: MULTICLOUD-639

    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: I7ffaa3d4e2df84b38b50e11900406b55f94c6de8

  - Correct k8splugin endpoint configuration in KUD test

    Plugin.sh was misconfigured to connect at wrong port
    of k8splugin service.

    Issue-ID: MULTICLOUD-686

    Signed-off-by: Konrad Bańka <k.banka@samsung.com>
    Change-Id: I53e7e4d6fdb727adc755318012ee262dbec811ef