j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/issues/doNotQualifyStatic.java

@@ -0,0 +1,10 @@
+//file
+class Outer {
+    public static Object o = new Object();
+
+    public static class Nested {
+        public void foo() {
+            o = null;
+        }
+    }
+}