Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - [docs] Adding apex deployment config guide

    JIRA: SDNVPN-171

    Change-Id: I076a087ab346e8e6e3063c958fefff657838b708
    Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 45df38f..38d1895 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 45df38fe0cd7a604827a5cde6ad6480971b0456b
+Subproject commit 38d1895faf9aaeefa6b64df6f4d149a00884b09b