Update git submodules

* Update docs/submodules/armband from branch 'master'
  - p/fuel: reclass: opendaylight: Use UCA repos

    Current opendaylight pillar enforces a full apt repository cleanup,
    removing Ubuntu Cloud Archive (UCA) repos in favor of adding
    pre-hardcoded Ubuntu archive repos.

    Mitigate this by ommiting "system.linux.system.repo.ubuntu" from the
    opendaylight pillar, leaving the default UCA repos in place.

    Change-Id: Ia2511e8028c8e28ec505c9a35b5dd2e76f4bcd0a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index f07754a..c28998b 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit f07754a88c17467036b9b0c92a6560eceb7bcd8e
+Subproject commit c28998b7218701d1a9c8b7de0e43c0c82eefb928