Android L: Instrumented tests fail

[lesn1kk]

Looks like in SDK 20-22, Field class doesn't contain accessFlags field that we use to change access modifiers of field we want to replace using reflection mechanisms. We need to change that or just add a check. In fact, access flags field doesn't have to be changed unless we are dealing with static final modifiers, so in the end we should just get rid of it and tests should work on platforms from Android Lollipop to Android Oreo. To be verified.