Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: Update and fix netvirt artifact download

    Change-Id: I7089603b982125f90dd5259e0720007ab3f910e5
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c1c6da4..c2cb929 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c1c6da438037580c8d4d3a85d7b93748d6c7ce3e
+Subproject commit c2cb9296949e8e8c2e5791c503197b526b6416f9