Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "update projects in scenario"
  - update projects in scenario

    1. post, add one or more new projects
    2. update, replace existed projects wholly
    3. delete, delete one or more projects by name
    4. in post&update, if schema is not consistent with ScenarioProject model,
    BadRequest will be raised(only extra keys will be detected currently)
    5. in post, if project already exist, return Conflict with already exist
    message

    Change-Id: Iead585f787a4acc61abce6c9d38a036739b498d6
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>