Update git submodules

* Update docs/submodules/armband from branch 'stable/euphrates'
  - u/fuel: Bump & rebase for debian_ip lowercase fix

    While at it, revert commit adding "opnfv" user to "libvirt" group,
    as it would break with the current event flow (opnfv user being
    created prior to libvirt group).

    Change-Id: I6f5d578153c33dcddac76bc7bc6b428fe6796b1a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 4b7e790d335787ce0837ca47025dd7a14287e52a)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index d79947a..cbd8566 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit d79947a082dd7d342b8572d7f74b690cae605b05
+Subproject commit cbd85660a376264b5fc3bde17e4d7c9dfbbd53d3