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>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 05e727e..73ff381 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 05e727e27aeabe2a1e3bed8ae501171ea93d54f5
+Subproject commit 73ff381c7bb32f13a3d14e96850b84ab37338633