Create protocol migration tests for Android

[hvge]

Currently, there are no protocol migration tests on Android. We should investigate whether it's possible to somehow automate this.

I'm not sure whether it's possible to unload classes in Android's VM, so the alternative is to build a special application that will have several build flavors, one per SDK version, so we can simply build & run flavored app in right order to test all upgrade steps.

The purpose of this task is to prepare a simple framework for better protocol upgrade testing.