Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/danube'
  - Fix the zrpcd running check within testcase3

    Check specifically the "running" state of the zrpcd service

    JIRA: SDNVPN-150

    Change-Id: I1b63f25dfab5fd4507cc219fb1c21291064a8bab
    Signed-off-by: tomsou <soth@intracom-telecom.com>
    (cherry picked from commit dc24635f0e1cb103c333f8b614a4801341b4f877)

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index bf201a5..ce12119 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit bf201a51b5d07bfd73d62070e09c6e7639001609
+Subproject commit ce12119b306d0269bf9710e9a48b5ef5c3134f6c