Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - update fraser release date

    Change-Id: If38328d7814497e9e213ec6edeff5057584d4601
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 785cd7b..9232531 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 785cd7b2bfd56a0f157898335a27ecf4ca9de782
+Subproject commit 9232531e6cd5a5fc00520f200350f141ed6a013b