zibuyu28

Results 3 issues of zibuyu28

### when lose connection with etcdv3, confd will used high cpu above 100% * I have tested in my local env, 1. first etcd is up, and start confd to...

- Targeted PR against correct branch (see [CONTRIBUTING.md](https://github.com/okex/okexchain/blob/develop/CONTRIBUTING.md#pr-targeting)) - [ ] Linked to github-issue with discussion and accepted design OR link to spec that describes this work. - [ ]...