Update git submodules

Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 794a3978adeb7616f79dfe96e0bc7fe3bc2170fb
  - Use ONAP core deployment type override in minimal Vagrant environment

    Core deployment type is a subset of previously used minimal override to
    make ONAP deployment even lighter on resources.

    It has been merged in OOM as: d7c495eeeaa3c24d355b9214bc7d0e59be9dd70e
    (Change-Id: Ibaec41f088f11f7fb4e7c476f742d12d29c5740b).

    This patch also updates documentation on resources required by this
    setup and adds example usage of Operator's tools.

    Issue-ID: ONAPARC-551
    Change-Id: Ifdb1d158311ba3ed0b5cf407d07ce028d1a0162f
    Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>