Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Fix permission when installing

    Change-Id: I8f5546bddbf634fa05337caa7c4d48a3f4f1db6b
    Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 6e3875b..1754fe0 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 6e3875bb506dc99a46e06df032590c11f63ac555
+Subproject commit 1754fe0cd71c3f28aad047fd125d2e2fd6590d7d