Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Document updates for Fraser

    Change-Id: I002848374caf28c0e6f4184bc9bd9e87b1918255
    Signed-off-by: nikoskarandreas <nick@intracom-telecom.com>
    Document updates for Fraser

    Fixed wrong release date.
    Removed a closed issue and a reference to it.

    Change-Id: I002848374caf28c0e6f4184bc9bd9e87b1918255
    Signed-off-by: nikoskarandreas <nick@intracom-telecom.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index fab5676..b7221d9 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit fab5676180d3c00f0e71f89766a026f51a0cab8a
+Subproject commit b7221d90abe4a735f606bfbf464e8c6512fc3a67