Rewrite 'react-native init' and 'react-native upgrade' without using Yeoman in preparation for templates support

Summary:
This is the manually imported version of https://github.com/facebook/react-native/pull/10786

This was mostly straigthforward by replacing the local-cli folder with the version I had in my local git checkout,
plus a few other files I listed with git diff --name-only.

Reviewed By: hramos

Differential Revision: D4201118

fbshipit-source-id: 4d0fb54b0edda9de1abba427958e420fd2ac105c