Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Avoid exiting the script if an error happens"
  - Avoid exiting the script if an error happens

    1. Avoid exiting the script if an tier fails
    2. Push logs to artifacts

    Change-Id: Ia258994e4694bb71615f7adc18967afcc237813f
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5218c9f..8efd31d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5218c9fc5a6884f7ddd086089d85eb547149391a
+Subproject commit 8efd31d199379d593f3ea74f7d8a7eefd6046f61