Update git submodules

Update git submodules

* Update docs/submodules/armband from branch 'master'
  - states/maas: rm Ubuntu boot entry on EFI systems

    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 via `efibootmgr`.

    Change-Id: I531d4bcb9f8d45740764f0dbab8fda49fbffac7e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>