Update git submodules

* Update docs/submodules/armband from branch 'stable/danube'
  - fuel, docs: fuel-menu: Align defaults with OPNFV

    Since Armband alters the bootstrap package list and/or kernel version,
    hanlded previously by fuel_bootstrap_cli.yaml, we need to refactor our
    patches a bit.

    NOTE: deploy-cache: We no longer include bootstrap package list in the
    bootstrap fingerprint; we only rely on the repo mirrors fingerprints,
    since bootstrap package list is mostly static across release cycles.

    Upstream-bug: https://bugs.launchpad.net/fuel/+bug/1679636

    JIRA: FUEL-266
    JIRA: ARMBAND-225

    Change-Id: I6c1b090df6eff69d60fa7ca779b3dde527e77879
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 48a9297abfe3b35da1a5c3e8b44a823be24af00e)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index bf84b5e..f4296ca 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit bf84b5e16c0c54c76b86393ce674ec6b604ddeb1
+Subproject commit f4296ca4cf69c632b53ce1dacf9333b290b8a014