Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Replace neutron client calls with openstack sdk

    JIRA: SDNVPN-220

    This patch replaces almost all calls of neutron client with
    openstack sdk. The calls regarding bgpvpn are not replaced
    due to lack of support from openstack sdk at the moment.

    Change-Id: Idf52b8c57b895f87ba6320e350bf170faa24d0a7
    Signed-off-by: Stamatis Katsaounis <mokats@intracom-telecom.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index c05105a..ebf6885 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit c05105a4f9f51f7bb31cad791e65d664e5a3bc4b
+Subproject commit ebf6885a907379083b360ae729f69151c1dd8115