Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "update versions under scenario"
  - update versions under scenario
    
    1. post, add one or more new versions
    2. update, replace existed version as a totality
    3. delete, delete one or more versions by name
    4. in post&update, if schema is not consistent with ScenarioVersion 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
    6. in update, if a version appears more than once, also return Conflict
    with already exist message
    7. add update with conflict unittest for projects
    
    Change-Id: I0d2c8a5567f3abce7b0313a64e18303af02cc002
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>
    

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