Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - [baremetal] Fix: wrong nic name idf index

    This was only affecting pod deployments with
    different board models, under the current limited
    support:
    - 3 KVMs will be same model and have the same NIC names
    - 2 Compute nodes will be the same model and have same NIC names

    For the computes nodes, br-mesh NIC name was wrong due
    to incorrect idf mapping

    Change-Id: I9685b35cb23b03be9fc0e6fe16c0712a9ad70e19
    Signed-off-by: Guillermo Herrero <guillermo.herrero@enea.com>
    (cherry picked from commit 378b4a72c27c941d5e37216edb23f224fbb58e26)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 380b737..7a464cc 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 380b7375c8be9f05277c6f991ba70801985ca8fa
+Subproject commit 7a464cc994463231bb7d5dfbc9a29bcfcea5bbdb