Update git submodules

* Update docs/submodules/armband from branch 'master'
  - p/fuel: Add opnfv user to all machines in the deployment

    Change-Id: I665b7498ade9fbd5b8c45d584a165673f1dc80d8
    Signed-off-by: Charalampos Kominos <Charalampos.Kominos@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 9dea03a..cec301a 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 9dea03a7fdf57cc10f67f30428ab0da667377ac3
+Subproject commit cec301af4f1d2a0512bb483cd9d665d70ec14251