j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/newClassExpression/newStaticInnerClass.java

@@ -0,0 +1,12 @@
+//file
+package demo;
+
+class Foo {
+  static class Bar {}
+}
+
+class User {
+  void main() {
+    Foo.Bar boo = new Foo.Bar();
+  }
+}