Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - update sdnvpn release notes for fraser 6.2

    Change-Id: I752fba0ba0d434ae1bc37b975479361f9d53e3b3
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 1180e1b..b5e7619 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 1180e1b5fdcfc51a453640b345060daef2533c1d
+Subproject commit b5e7619baeecec2494994caba86df275fa197c99