Update git submodules

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>