j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/localVariable/varWithNoInitializer.kt

@@ -0,0 +1,10 @@
+class C {
+    fun foo(p: Boolean): Int {
+        var a: Int
+        var b: Int
+        a = 10
+        b = 5
+        if (p) a = 5 else b = 10
+        return a + b
+    }
+}