Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add build "yardstick-image-k8s" docker image job"
  - Add build "yardstick-image-k8s" docker image job

    JIRA: RELENG-408

    Change-Id: Ie6ac842ebd1bb6264c88a7f8ee0446d76fc3dbdd
    Signed-off-by: rexlee8776 <limingjiang@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index aa6ebe4..a1ec334 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit aa6ebe41c388f115c4f4aa7543bc75f5e39a4f0f
+Subproject commit a1ec3348ab3fe09c08642763843d666fa4337cc9