Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "[baremetal] Migrate public bridge to ovs" into stable/euphrates
  - [baremetal] Migrate public bridge to ovs

    Get rid of "ovs-to-linux" links, instead of this setup native ovs
    bridge for public interface and link it with neutron external bridge.

    Change-Id: I483881e78f22fc035107a622307d95761c4a5667
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit bcba227e4947bf1e6976b2a743b87c28ae9645c9)