Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "virtual: Add infra/init.yml for each scenario"
  - virtual: Add infra/init.yml for each scenario

    Align our reclass model for virtual PODs with baremetal, by adding
    an infra init file for each scenario, setting up cluster_name via
    scenario infra init instead of scenario init.
    While at it, reduce redundancy by defining cluster_domain based on
    cluster_name via common infra init.

    JIRA: FUEL-310

    Change-Id: I5e89c883853fa66cb1c1fc69ce5766ee136ac477
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>