Update git submodules

* Update docs/submodules/ovsnfv from branch 'master'
  - Disable building of RPMs.

    RPMs are pulled by the installers from downstream distros or
    elsewhere since the last few releases. Therefore there is no
    longer any need to build these artifacts in this project.

    Change-Id: I72592d76ffcd41457f2e6c7d43310dd73c3411f5
    Signed-off-by: Thomas F Herbert <therbert@redhat.com>

diff --git a/docs/submodules/ovsnfv b/docs/submodules/ovsnfv
index 3412a64..5b7a8fe 160000 (submodule)
--- a/docs/submodules/ovsnfv
+++ b/docs/submodules/ovsnfv
@@ -1 +1 @@
-Subproject commit 3412a645cdea8c4eb28e8406ed161e8140011d0f
+Subproject commit 5b7a8fe64efa5d1bc32a0c5328e073463fd2393b