Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - write sdnvpn test result into db

    The details of the test results are not flushed into db which causes
    test report showing empty data

    JIRA: SDNVPN-183
    JIRA: FUNCTEST-874

    Change-Id: Ie539685990014149434d59e61490750ae318b3ba
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 6c878a2..2907946 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 6c878a213164dc895841046170869a50e41c9e7a
+Subproject commit 2907946ee8931f749881e48e9601779be50b7e37