Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Merge "AArch64: Switch jumpserver VMs to virtio video" into stable/euphrates
  - AArch64: Switch jumpserver VMs to virtio video

    Drop vgabios dependency by switching video from VGA to virtio for
    all VMs spawned on the jumpserver.

    NOTE: This requires virtualization packages on the jumpserver to be
    up to date (e.g. libvirt, QEMU).

    JIRA: ARMBAND-306

    Change-Id: I73913e1ae8584f4e73b92994f78f7ec363cba3ec
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit d058675b9a4274336ae3497914d6651f653ccde0)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index b6e65db..4401837 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit b6e65dbb9952aeafeff6fcc07b6dcd97940d62ff
+Subproject commit 4401837178770d50b2d1579a01fb7e6aaca37907