Đào Hoàng Sơn 3a8e598ca2 [dart-dio] Various fixes (#5027)
* [dart-dio+time_machine] Add missing import, serializer

* [dart-dio] Remove bad import from `http` package

* [dart-dio] Use raw strings for those that contain variable name.

This should eliminate potential issue with variables like `$ref`.

* [dart-dio] Use `_path` instead of `path` to avoid potential conflict with op params.

See 1bec0b47b1/Kubernetes.json, there are a few with `{path}` param.

* [dart-dio+time_machine] Use `OffsetXxx` classes for date time values
2020-01-20 11:56:24 +08:00
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2020-01-20 11:56:24 +08:00
2020-01-20 11:56:24 +08:00