j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/tryWithResource/MultipleResources.java

@@ -0,0 +1,12 @@
+//file
+import java.io.*;
+
+public class C {
+    void foo() throws IOException {
+        try(ByteArrayInputStream input = new ByteArrayInputStream(new byte[10]);
+            OutputStream output = new ByteArrayOutputStream()) {
+            output.write(input.read());
+            output.write(0);
+        }
+    }
+}