Update git submodules

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)