Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[baremetal] idf support for different board types"
  - [baremetal] idf support for different board types

    This modification enables having different models of target nodes
    but restricts them to two groups of the same kind assuming:
     - 3 KVMs will be same model and have the same NIC names
     - 2 Compute nodes will be the same model and have same NIC names

    This is an ad-hoc change for arm-pod7. Will work for all other setups
    but the jinja2 logic should be evetually extended to support a per
    board approach, allowing any board to be any kind

    Change-Id: Ie994d661e3dbe5b9a33d290a850a6152cf320c86
    Signed-off-by: Guillermo Herrero <guillermo.herrero@enea.com>