Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Fix the config.yaml including for each testcase

    At each testcase, adapt the way config.yaml is included via
    sdnvpn.lib.config.TestcaseConfig().
    The full path should be included, instead of just the testcase name

    JIRA: SDNVPN-180

    Change-Id: I34828cc3681f08b843db49c6a221602b5b2022bf
    Signed-off-by: tomsou <soth@intracom-telecom.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 56107fb..8d84c2c 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 56107fbfd2c991cc00d999fb3b081c979f56db86
+Subproject commit 8d84c2c31b28fb70984407740d3e3a8105993b60