Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - [baremetal] Restart gateway networking service

    Make sure all missing interfaces/links are up & running
    (e.g. br-ex <-> float-to-ex <-> br-floating).
    Fix (for https://github.com/saltstack/salt/issues/40262)
    into linux formula brought in a weird behaviour with
    network/interfaces.u/ items.

    Change-Id: Ic13f0ed2063455ae191bbc99920f97c5ecaa61fd
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>