react-native link works incorrect

[itoys]

After merging #17961 react-native link command works wrong.

Before, params field was used only for android and waiting for user response, now it uses for all platforms without waiting user input.

Seem like that main reason it's that you doesn't work with promises and just use Object.keys().forEach(link)

Environment

Environment:
OS: macOS High Sierra 10.13.3
Node: 8.9.1
Yarn: 0.15.1
npm: 5.6.0
Watchman: 4.7.0
Xcode: Xcode 9.2 Build version 9C40b
Android Studio: 3.0 AI-171.4443003

Packages: (wanted => installed)
react: 16.3.0-alpha.1 => 16.3.0-alpha.1
react-native: 0.54.1 => 0.54.1

Expected Behavior

1. Waiting user interaction while params polling
2. If you would like to add params fo all platforms, please add platform field for filter purpose

Actual Behavior

I've got duplicate questions in terminal, "postinstall" script runs before user set up params

Steps to Reproduce

$ react-native init AwesomeProject
$ cd AwesomeProject
$ npm i react-native-code-push --save
$ react-native link react-native-code-push

So we'll get mess in terminal