Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "lib.sh: Use host bridge in favor of virsh network" into stable/euphrates
  - lib.sh: Use host bridge in favor of virsh network

    If a linux bridge already exists on the jump host, with the same
    name as the value passed via `-B` or the default, use it instead
    of trying to create a virsh network.

    Change-Id: If7f0753ec366d429ff101c2b37dd68f895903404
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 96cccf2b507949978c1b37c65961a5182ffbbbfd)