Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "[cleanup] Drop cfg01 node def for ODL L2" into stable/euphrates
  - [cleanup] Drop cfg01 node def for ODL L2

    Remove obsolete ODL L2 top node definition, which currently breaks
    `reclass-salt --top`.

    Change-Id: Ic05f87dd7edea5b9f38e996bb02a3e1062caf98a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 15cc7c3..644a0b4 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 15cc7c371020cf860f3d19318e6dc5af31eea5d6
+Subproject commit 644a0b4a671af5a146b8a8a64cc017e98f0d5986