j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/methodCallExpression/vararg1.kt

@@ -0,0 +1,11 @@
+import java.lang.reflect.Constructor
+
+class X {
+    class object {
+        throws(javaClass<Exception>())
+        fun <T> foo(constructor: Constructor<T>, args1: Array<Any>, args2: Array<Any>) {
+            constructor.newInstance(*args1)
+            constructor.newInstance(args1, args2)
+        }
+    }
+}