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Add DNS health checker #429
I implemented DNS helath checker.
I want merge it to the built-in health checker.
There is also a way to use MISC_CHECK, but we avoided it for the following reasons.
In preparing the DNS checker, also modified layer4 library. It's added support for implementation of the UDP-based health checker.
I believe to add to the built-in health checker is a good way, given the importance of the DNS.