Update git submodules

* Update docs/submodules/armband from branch 'master'
  - u/fuel: Bump & rebase for new deploy arg `-E`
    
    Slight refactor of Armband high states, combine all parts touching
    salt minion into a single `armband.salt_minion` state.
    
    Also bring in support for NVRAM-backed domain undefine via
    `virt.purge` by passing down the proper flag to libvirt.
    
    While at it, squash mcp/patches touching the same lines of code
    in <_modules/seedng.py>, so deploys using `-f` do not fail at the
    patch stage (due to conflicting patch lines, checking for `patch -R`
    does not work as expected).
    
    Change-Id: Iefca061e641854d28bd8576f2b4547c87c239e32
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    

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