Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/danube'
  - Merge "fuel-menu: Align defaults w/ OPNFV bootstrap cfg" into stable/danube
  - fuel-menu: Align defaults w/ OPNFV bootstrap cfg

    Instead of overwriting fuel_bootstrap_cli.yaml during post-install,
    with a static config which we need to manually sync in OPNFV after
    each upstream change, make the whole thing dynamic by syncing (via
    patch) fuel-menu's default settings with OPNFV bootstrap.

    This allows us to drop the static fuel_bootstrap_cli.yaml.

    JIRA: FUEL-266

    Change-Id: I132f2a272c764ad0fc84b3e0e0e1222b1fab1cd2
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit d116928396655b6db92b6786022ff68f13df58c7)