Update git submodules

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

    Change-Id: I752fba0ba0d434ae1bc37b975479361f9d53e3b3
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>
    (cherry picked from commit b5e7619baeecec2494994caba86df275fa197c99)

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 93001e6..48cf1c7 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 93001e61121521cbb20b499910e89ba58496d5ef
+Subproject commit 48cf1c7577afc9e2def8065b21c5a39f1b57674c