Use webpack 3's standard way to generate a manifest in CommonsChunkPlugin (#1028)
Use webpack 3's standard way to generate a manifest in CommonsChunkPlugin (#1028)

The doc URL: https://webpack.js.org/plugins/commons-chunk-plugin/#manifest-file
* `minChunks` is set to `Infinity` so that only webpack runtime is written to manifest file.
* `chunnks: ['vendor']` is removed as entry chunks are selected if `chunks` is omitted.
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