Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/danube'
  - Update release notes

    Uplifting docs to D-3. Update release-notes
    to reflect the remaining issues we have not
    been able to resolve.

    JIRA: SDNVPN-169

    Change-Id: I5997f1495fc37ecbc06a8c7b8071a7ba7f2c099c
    Signed-off-by: panageo2 <panageo@intracom-telecom.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 58a0249..05f2a54 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 58a0249ab01b1c66c71bc402a6ea7f53e34b6c35
+Subproject commit 05f2a546505b643b0301517587680bf5d7e0936a