Update git submodules

* Update docs/submodules/sdnvpn from branch 'stable/fraser'
  - [Bug Fix] Determine the BGP entity owner in ODL Cluster

    In HA deployments is essential to determine which is the ODL
    BGP entity owner and transform that ODL to BGP speaker.
    This is necessary because of this bug [0] in netvirt. So
    we can consider this as a workaround for the testcase_3.

    Note: This patch is dependent on this task resolution [1]
          for master branch.

    Note: This patch works fine in stable/fraser branch.

    [0] https://jira.opendaylight.org/browse/NETVIRT-1308
    [1] https://jira.opnfv.org/browse/SDNVPN-217

    Jira: SDNVPN-214

    Change-Id: I383987e650da45400a3a6437dbdaaea904db9265
    Signed-off-by: Dimitrios Markou <mardim@intracom-telecom.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 9ce4e2d..88bf65b 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 9ce4e2db4f6ace34dbd4a6308983589e8e810471
+Subproject commit 88bf65b1250fb3ad84b027a57c4fc5ee077ff3de