Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "[baremetal] public gateway setup on prx nodes" into stable/euphrates
  - [baremetal] public gateway setup on prx nodes

    - prx: add route for public traffic to public interface
    - prx: add route towards salt master through maas
    - remove dashboard class from proxy node (already implements horizon)
    - remove dashboard (and benchmark) class definitions (no longer used)
    - (temporary) backport Pharos change for adapter template

    JIRA: FUEL-305

    Change-Id: Ia14a18ac0123c1134d8d99dc43da9a1f770001d0
    Signed-off-by: Guillermo Herrero <guillermo.herrero@enea.com>
    (cherry picked from commit 07f4e0238646fcb77072769feb8a0b68df52caca)