Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Ease configuring extra specs via env vars"
  - Ease configuring extra specs via env vars

    Ease configuring flavor extra specs, as well as
    image extra specs.

    Set environment variables for image_properties and
    flavor extra_specs for ovs|fdio scenario from the start.

    Image extra_properties and flavor extra_specs
    will continue to get updates from functest config file
    but so will from IMAGE_PROPERTIES and FLAVOR_EXTRA_SPECS
    env variables.

    Change-Id: Ie1c69e66d2e2e158915d214402fe44d9991c56d3
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>