Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - lib.sh: rm Ubuntu boot entry on EFI systems

    On EFI-enabled systems, grub-install from grub-efi-* package
    installs a boot entry named "ubuntu".

    MaaS relies on IPMI to set boot order to PXE first; however
    on systems with buggy firmware or without full IPMI support,
    that fails, leading to booting Ubuntu from hard disk instead.

    Work around this by clearing any previous Ubuntu boot entry
    from board flash, before starting a new baremetal deploy.

    NOTE: This only runs against nodes that are online from a
    previous deploy.

    Closes: ARMBAND-47

    Change-Id: I1c4ece09e42845ce2a1b7119ec69e46e5ca12376
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 4e2c736cce578d1073dab0e0960b524b1dcc663a)