fix the bug of the api's CreateStrategy will duplicate insert the same item ! #334
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虽然模板页面中<该模板中的策略列表>中监控项是可以重复添加的,目前api也是可以重复添加的,但是正常情况下重复添加相同的监控项有点多余,如果相同的监控项越来越多对于查询表的速度将会变慢,个人觉得还是需要避免插入相同的数据。