[Android][RNTester] add react_native_config to RNTester

[ferrannp]

Summary

It was not possible to run RNTester in Android P and connect to the packager.

Changelog

[Android][RNTester] add react_native_config to RNTester for the packager to be able to connect with Android P devices

Test Plan

Just run RNTester in Android P or above (emulator or real device).

[pull-bot]

Messages

📖

📋 Changelog Format - Did you include a Changelog? A changelog entry has the following format: [CATEGORY] [TYPE] - Message. CATEGORY may be: General iOS Android TYPE may be: Added, for new features. Changed, for changes in existing functionality. Deprecated, for soon-to-be removed features. Removed, for now removed features. Fixed, for any bug fixes. Security, in case of vulnerabilities. MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.

Generated by 🚫 dangerJS against 581efa2

[cpojer]

Thanks!

[facebook-github-bot]

@cpojer is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @ferrannp in 7e37370.

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