Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: update 3rd party netvirt CI

    Intel slave no longer exists. Moves the Apex netvirt snapshots to run on
    Apex slaves.

    Change-Id: I3d9d32455e5a24cb64070677a32c5908cc331326
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 47ddd0a..cfa6081 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 47ddd0ab7b50538e0f7e7c23ad7567a1126eac57
+Subproject commit cfa60811784212ba2072c8c2a6c98fd3b777036d