Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Fix so that testcases run in order.

    A new key "order" was added in config.py file to prevent the
    testcases executed in random order.

    JIRA: SDNVPN-216

    Change-Id: I4ee72cb98351e35bf50ecf9c6dd1506a59e34f6e
    Signed-off-by: dimitris.tsiolakis <dmts@intracom-telecom.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 9d501e5..c8f970e 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 9d501e5cbc1c384f405c8238fd86785561b9e39e
+Subproject commit c8f970e5b5968952f9c1fea5c7c63bddb12a7b73