Update git submodules

* Update docs/submodules/ovsnfv from branch 'stable/danube'
  - Add and update apex sdn and ovs scenarios to Danube 1.0
    Include two odl_l3 scenarios and the no-sdn l2 ha scenario.

    Change-Id: I6a3d447b42a2d69ce3e50e007a66e22668a1383c
    Signed-off-by: Thomas F Herbert <therbert@redhat.com>
    (cherry picked from commit 3412a645cdea8c4eb28e8406ed161e8140011d0f)

diff --git a/docs/submodules/ovsnfv b/docs/submodules/ovsnfv
index 9a1a1e3..f8aa4ee 160000 (submodule)
--- a/docs/submodules/ovsnfv
+++ b/docs/submodules/ovsnfv
@@ -1 +1 @@
-Subproject commit 9a1a1e3cd9ed2e8a3b960b63d4c740ae55abe836
+Subproject commit f8aa4ee9ebd31e3a20891af6421a6dd5c0072bb4