merge STF678_Task1_MEC021 into STF678_Task4
update etsi mec sandbox mec 021 AMS front-end file as per 3.1.1 AMS document version and merge request for STF678_Task1_MEC021 into STF678_Task4
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update etsi mec sandbox mec 021 AMS front-end file as per 3.1.1 AMS document version and merge request for STF678_Task1_MEC021 into STF678_Task4