[WIP] Fixing Android support for demo-react-native example project

[chrmod]

Having problems with running Android tests on Travis CI, we tried to get any of the example projects, but without luck. This PR aims to update demo-react-native project to run Android tests.

Submitter version works, but requires some cleanups.

[rotemmiz]

Hey @chrmod , thanks for the PR!
Demo projects were updated recently to run most recent configuration. If you still see anything missing, please rebase this PR and submit again.

[chrmod]

Hi @rotemmiz thanks for info, I will check that soon.
Can you please take a look on the issue I've opened on state of Android CI #594
The purpose of this PR was to ensure you can use detox for Android and what we've found out is that it works fine when run on MacOS but does not work on Linux.

[rotemmiz]

Closing this PR as the projects are mostly updated.
Feel free to reopen after rebasing if you want to change things currently on master.