Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "clean the workspace in the publisher"
  - clean the workspace in the publisher

    As doctor run tox under root user, we need to clean
    the workspace in the publisher, otherwise the tests
    which come next will be fail when they operate in
    the workspace with jenkins user.

    Change-Id: I14fbabc7516153c6d93e53baf106067ff4194af6
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 0e0dda7..3b5a3df 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 0e0dda750278d88e89ba348cdf489a910cd40054
+Subproject commit 3b5a3df47ff8d7580ec2df5f0a6b0cd2bd29cf02