j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/staticMembers/PrivateStaticMethods3.java

@@ -0,0 +1,15 @@
+//file
+class A {
+    public static class Nested {
+        void foo() {
+            privateStatic1();
+        }
+    }
+
+    void bar() {
+        privateStatic2();
+    }
+
+    private static void privateStatic1(){}
+    private static void privateStatic2(){}
+}