Unit test for UidRange.java and UidRange.cpp

Verifies that:
 - UidRange only accepts non-negative UIDs
 - UidRange only accepts start UID <= stop UID
 - Native implementation is in sync with java implementation (via JNI)

Change-Id: I8b412781efe9cfda6d5e666e37fe0d8f5e2b6ecc