j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/constructors/secondaryConstructorsVisibility.java

@@ -0,0 +1,23 @@
+class A {
+    public A() {}
+
+    public A(int a) { this(); }
+
+    protected A(char c) { this(); }
+
+    A(float f) { this(); }
+
+    private A(double d) { this(); }
+}
+
+public class B {
+    public B() {}
+
+    public B(int a) { this(); }
+
+    protected B(char c) { this(); }
+
+    B(float f) { this(); }
+
+    private B(double d) { this(); }
+}