JDWP: add more stack frame tests

Adds new tests for StackFrame.GetValues (GetValues002Test) and
StackFrame.SetValues (SetValues002Test) commands for all primitive
types and special reference types (Object, Array, Class, ClassLoader,
String, Thread and ThreadGroup). These tests can be extended in the
future to check more sophisticated stack context.

Also cleans up existing GetValuesTest and SetValuesTest by moving
common code to a superclass. And adds extra tests for error code
checking.

Bug: 15680615
Change-Id: I338d555d6248393fe0eade9a9af0ccd1784bdc2e