Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[scenario] Factor out common nodes, states"
  - [scenario] Factor out common nodes, states

    Make the bulk of scenario files static again by shifting out all
    common virtual nodes (mas01) and states (virtual_init, maas etc.)
    to default.yaml(.j2).

    This allows us to parse scenario-specific data during first j2
    expansion, preparing for the new Pharos installer adapter that
    relies on `conf.virtual.nodes.control` length to construct the
    proper list of MaaS node definitions (kvm{01,02,03} vs {ctl01,gtw01}).

    Change-Id: I666ab5bd6bb2a42f98646af51950f6b9fffa0e8b
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>