Summary:**EDIT: **
This has been updated to simply fix the `run-android` command so that it runs on all connected devices instead of throwing an error.
**Original PR description:**
This adds a new command to the react-native CLI. When executed this command will install and successfully execute your app on all connected Android devices:
`react-native run-android-all`
Closes#5901
**Note:** I wasn't sure how to approach this API since it seems a bit like a flag, but I didn't see any other flags implemented in the cli so it seems like the current trend is to keep all commands to a single phrase. I am open to changing this if need be.
Closes https://github.com/facebook/react-native/pull/5902
Differential Revision: D2976580
Pulled By: mkonicek
fb-gh-sync-id: e7f734478f719cf59e0192b5f4be3f6408c31964
shipit-source-id: e7f734478f719cf59e0192b5f4be3f6408c31964
10ad47a711