update customs in scenario

update customs in scenario

1) post to add one or multiple test cases
2) update to substitute all the test cases
3) delete with body to delete one or multiple test cases
4) to facilitate the process and response body usually useless,
   if update success all updates(scores/trust_indicators/customs),
   return 200 with no response body

Change-Id: I5148f172989fa8e0e70ffed92ee383c0520dbb41
Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>