Update git submodules

Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to 3fbeaf029e392a829ab81ea7e87e18c90c58545f
  - Increase minimal Worker storage size

    At least 40GiB disk is required for Worker VM to store all necessary
    Docker images, otherwise it runs out of storage. VM resize can be done
    only during its creation (see "machine_virtual_size" [1]).

    VM data hashes no longer fitted in single lines nicely, hence they were
    broken into several lines.

    [1] https://github.com/vagrant-libvirt/vagrant-libvirt#domain-specific-options

    Issue-ID: ONAPARC-551
    Change-Id: Ib267fd8097b51f53565e0c8f3be7c86c2b3c68ad
    Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>