Migration from parent to child process

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Motivation

Both Outbound and Inbound mode in esl sockets are all long link over TCP, so when we need fix some bug and update some new control logic of our application we need migrate from the parent to child process on single node which could keep the sockets alive.

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you could commit your implementation in the migrate.go file

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maybe you could see this project for some inspiration

https://link.zhihu.com/?target=https%3A//github.com/rcrowley/goagain