Respect app's eslintrc

[chyipin]

Allow react app to configure eslint without resorting to eject

Test Instructions

1. npm link react-scripts globally
2. create new create-react-app
3. npm link react-scripts in new app
4. modify eslintConfig in package.json as follows:

 "extends": [
"eslint:recommended",
"react-app"
]

5. exercise the script, e.g.:
   npm run build
6. verify output

./src/serviceWorker.js
Line 44: Unexpected console statement no-console
Line 72: Unexpected console statement no-console
Line 85: Unexpected console statement no-console
Line 97: Unexpected console statement no-console
Line 123: Unexpected console statement no-console

[mrmckeb]

Hi @chyipin, thanks for your time here, but this is a duplicate of #7036, which will resolve this.

[chyipin]

Thanks for the heads up. I'll follow the other PR.