Update git submodules

Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 6bbff98bfe55838448a03ec52c25c06feec2e8db
  - k8s: Move release-specific files to separate directory

    Kubernetes cluster deployment procedure changed with Dublin release
    (Rancher to RKE). In order to prepare for further adjustments,
    incompatible content will be moved to separate directories.

    Once Casablanca becomes obsolete (by the time of El Alto), files
    specific to that release will be removed completely.

    Issue-ID: SECCOM-235
    Change-Id: Iaa0fc2f6ad330ec09dcfdf8a2d27b8a4dc433a0f
    Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>