Haoqun Jiang 448dbdb4f3 fix: use yarn --version to detect yarn (#4336) ...

- We never referred to `yarnpkg` anywhere else in the codebase
- For the rare case that `yarn` binary is overridden by Hadoop YARN,
`yarn --version` will throw (it only supports `yarn version`), therefore
it won't pass this check.

Fixes #3941.
Closes #3942.

2019-07-23 20:35:05 +08:00

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