Update git submodules

* Update docs/submodules/armband from branch 'master'
  - p/fuel: Rebase, drop --depth=1 when cloning Fuel

    `git clone --depth=1` does not preserve git history, so 3-way merge
    is not possible.

    There are 2 ways to fix this:
    - (recurrent) rebase patches by adjusting patch context;
    - (one-time, with a recurrent very small performance hit) preserve git
      history when cloning Fuel@OPNFV in salt.sh;

    So, let's drop "--depth=1" and ensure `git am -3` will continue to work
    on future patch context changes (where possbile).
    While we're at it, also rebase our current patches.

    Change-Id: Iacfb4daf90a170174405410ff9c988c4fcac79ca
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index de0b0f1..a38deb8 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit de0b0f160f6ac408c2ba302507ede4d0a537b73f
+Subproject commit a38deb88ed5fc0dc7e94404ef522898cb5741fb6