j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/tryWithResource/MultipleResources.kt

@@ -0,0 +1,13 @@
+import java.io.*
+
+public class C {
+    throws(javaClass<IOException>())
+    fun foo() {
+        ByteArrayInputStream(ByteArray(10)).use { input ->
+            ByteArrayOutputStream().use { output ->
+                output.write(input.read())
+                output.write(0)
+            }
+        }
+    }
+}