more android/compatibility fixes
- fixed a JDK-serialization compatibility issue occuring when object is written by default impl and read using stream.getFields machinery.
- fixed a JDK-serialization compatibility issue occuring when stream.putField puts a field name which is not part of instance names on reader side (renaming of fields across JDK implementations).
- kson test failed on 1.7
Note: Emulating JDK-serialization behaviour is expensive. Consider registering custom serializers based on profiling data for optimal performance. fast-serialization speeds up the default case (no readObject/writeObject or Externalizable).