Update git submodules

* Update docs/submodules/armband from branch 'stable/danube'
  - Remove BGPVPN plugin from docs

    Update the docs to reflect that BGPVPN is not
    participating to the D1 release

    Change-Id: I67600370c63373b4efc1020e03977a83d3833857
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>
    (cherry picked from commit fd784158ad5973136a88b3cf40504cef355991af)

diff --git a/docs/submodules/armband b/docs/submodules/armband
index 06f5c26..cd4446c 160000 (submodule)
--- a/docs/submodules/armband
+++ b/docs/submodules/armband
@@ -1 +1 @@
-Subproject commit 06f5c262f48a3bc244cc6d47e83b9f50f1730d61
+Subproject commit cd4446c0d0eff64a52ff40aa436c7a38e962b04f