j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/constructors/parameterDefaults2.java

@@ -0,0 +1,18 @@
+package pack
+
+class C {
+  C(int a, int b, int c, int d, int e) {
+  }
+
+  C(int a1, int b1, int c1) {
+    this(a1, b1, c1, 0, 0);
+  }
+
+  C(byte b) {
+    this(b, 0, 0, 0, 0);
+  }
+
+  C() {
+    this(0, 0, 0, 0, 0);
+  }
+}