Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Bug-fix: Cleanup Workspace after Testing"
  - Bug-fix: Cleanup Workspace after Testing

    JIRA: BOTTLENECK-196

    RT

    Change-Id: If98c2cf3636f5f65006f7418851e8d2a63a712fa
    Signed-off-by: Yang Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ad6b5b4..89d4fdf 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ad6b5b4272098809c5bb92bed06415a11515a5dc
+Subproject commit 89d4fdff5458510fcc74c52af13ee6f76cb79fb7