Update git submodules

* Update docs/submodules/armband from branch 'master'
  - u/fuel: Bump & rebase for vlan parametrization

    Change-Id: If8b154835b4ac18117108c6a0070a65f6db3e011
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 8905694..5491081 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 8905694cb9cce2841407d82d403b9d5abde2de6f
+Subproject commit 5491081be01a3ec9cedc5a8f57a07510ef951a3f