Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "update installer under scenario"
  - update installer under scenario
    
    1. post, add one or more new installers
    2. update, replace existed installers as a totality
    3. delete, delete one or more installers by name
    4. in post&update, if schema is not consistent with ScenarioInstaller model,
    BadRequest will be raised(only extra keys will be detected currently)
    5. in post, if installer already exist, return Conflict with already exist
    message
    6. in update, if a installer appears more than once, also return Conflict
    with already exist message
    
    Change-Id: I830dba3bcf5f1a9d1c93513b4aae59009f69dc8f
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>
    

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