Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add builds for Barometer DMA docker image"
  - Add builds for Barometer DMA docker image

    Push OPNFV docker builds for barometer-dma image

    Change-Id: I50373233254b8315c48544bae916ccf8485e640d
    Signed-off-by: Tomofumi Hayashi <tohayash@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 989757d..aa2b0e5 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 989757d40d86b37953dd15995987965e793e6b44
+Subproject commit aa2b0e57b5578c0454c35dbe8abf6bd3cb1cb250