Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Change tempest_smoke_serial to odl_netvirt"
  - Change tempest_smoke_serial to odl_netvirt

    Change-Id: Id4eee99b339ade6bec9f686a9705b31a93b0169c
    Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3239c88..b3e0ca2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3239c88f1f6a7fbc7394b6dba72fb697b12608a2
+Subproject commit b3e0ca2af151693f8e6440c78af733700a6296de