Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Merge "Add possibility to install rpms"
  - Add possibility to install rpms

    Change-Id: I1e5950e3331e76d71aca748f962ba2c5c3ea7541
    Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 70e7857..6f75009 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 70e78577e8736d17fe3d99c9c276d7ca9b6ea89b
+Subproject commit 6f750095ce1db59b3772c3461d4178ce12b11ae0