Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - 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>
    (cherry picked from commit d8dd9847b7a534b3c78af1b3eb772f07a3543d0c)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 1d42906..3293d28 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 1d42906057483865e5e8344fc186ea6299c7daf4
+Subproject commit 3293d28284b3d2d140f3b82452cfb6b16a7f2f2a