Update git submodules

* Update docs/submodules/armband from branch 'master'
  - p/fuel: Bump GlusterFS to 3.13 (was 3.12)

    GlusterFS PPA now has arm64 binaries for 3.13, use them to drop one
    more patch and align with Fuel@OPNFV.

    Change-Id: I0769d6c3f34bb880fcd8f5ed70b0c2bf561d450a
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index b327d82..650b581 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit b327d829cdb20a81c63f4039ee7c9950be66ed80
+Subproject commit 650b581cfb03cdd723541ec41ff3530391e4c76e