Update git submodules

Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to f816c306b95ab83cc3b5da5991526ce43c7808a4
  - Update to vCPE doc regarding service csars download

    Service csars no longer need to be manually transferred
    from robot container as they are automatically downloaded
    by vcpe scripts and ete-k8s.sh at distributevCPEResCust
    distribution.

    Change-Id: I9163972df974828083e3204b5b8786d4bcce2848
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
    Issue-ID: TEST-228