j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/rawGenerics/rawGenericMethod.java

@@ -0,0 +1,15 @@
+//file
+package demo;
+
+class TestT {
+  <T> void getT() { }
+}
+
+class U {
+  void main() {
+    TestT t = new TestT();
+    t.<String>getT();
+    t.<Integer>getT();
+    t.getT();
+  }
+}