Update git submodules

* Update docs/submodules/armband from branch 'master'
  - p/fuel: Fix opnfv user missing _param

    While at it, also use proper mechanism to fetch _param:opnfv* in
    opnfv/adduser.sls.

    Change-Id: Ic74e14f609bc1648b30d04f38ac3cca4a6d0850e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/armband b/docs/submodules/armband
index cec301a..93beeac 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit cec301af4f1d2a0512bb483cd9d665d70ec14251
+Subproject commit 93beeac737a5b283fc3ae20d31226ea64bee232b