rewrite dns notify mechanism #558
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在MIUI上发现，各个network的available和lost是互相独立的，会出现cellular available -> wifi available -> cellular unavailable -> cellular available这样的时序，按现有代码，cellular的变化会污染wifi的结果，导致wifi状态下dns却改成了cellular的，导致网络不通。没有用户报告的原因是在所有dns都不通时会默认去用default nameserver，但对于wifi是公司网络且需要公司内部dns解析场景，就会导致页面无法打开。
这里重新实现了dns感知机制，将每个network的dns状况单独保存，并按自定义的优先级在多个network之间获取dns，来规避这个问题。