Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to f4129a00c88f5ff1e21e139340956df50fadb456
  - Source /etc/environment for tests

    After KUD deployment (at least aio.sh),
    if running related tests immediately in the same shell session,
    system wide environment variables (/etc/environment) are not effective.

    This commit sources /etc/environment in commonly used _functions.sh.

    Issue-ID: MULTICLOUD-619

    Change-Id: I75cccdd8bdc8a67b92239704160331c58ad69d08
    Signed-off-by: Samuli Silvius <s.silvius@partner.samsung.com>