j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/localVariable/varWithNoInitializer.java

@@ -0,0 +1,11 @@
+//file
+class C {
+    int foo(boolean p) {
+        int a;
+        int b;
+        a = 10;
+        b = 5;
+        if (p) a = 5; else b = 10;
+        return a + b;
+    }
+}