Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - potential fix for attaching router with external network gateway

    In the CI environment, whenever testcases attaches a router with
    external network gateway sometimes it throws the error "No more IP
    addresses available on network". This could be due to stale floating
    ip's exist in the deployment which is cleaned up now before executing
    sdnvpn testsuite.

    JIRA: SDNVPN-212

    Change-Id: I027a833f13b1bdddd83dc8c7e7f7292e20b10bb8
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 2b8d01a..1bf65fd 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 2b8d01a7f79b0d3903964827be56347dc83d5591
+Subproject commit 1bf65fd6d92cdf2c0ad694662cbc12b7764e3364