Update git submodules

Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - p/fuel: kvm nodes: Configure repos before new krn

    Armband requires a custom kernel on baremetal nodes (kvm, cmp).
    However, the repos (configured as part of `linux.system` high state)
    were added before installing the kernel only for cmp nodes.

    Change-Id: Ie8d6e9cf4eaa84c459a70112ef002d09be9c4cf4
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 80f5ef39fb9057f42370333bb4d465349efe52b3)