Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "reclass: maas: Dynamic machine definitions"
  - reclass: maas: Dynamic machine definitions

    Refactor maas machine definition flow from going through variables
    in pod_config.yaml to directly handling it in Fuel using a new j2
    template.
    This prepares for future improvements allowing a dynamic compute
    node count, as well as parameterizing new values via j2.

    For now, node roles and count are still statically mapped to PDF
    nodes.

    JIRA: FUEL-319

    Change-Id: I770d82987fcb99792f9d5bc0857ab513f5cd3731
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>