JetDiagnosticsTest migrated to TestGenerator

- test data files renamed from *.jet to *.kt

compiler/testData/diagnostics/tests/InnerClassClassObject.kt

@@ -0,0 +1,20 @@
+// http://youtrack.jetbrains.net/issue/KT-449
+
+class A {
+    class B {
+        <!CLASS_OBJECT_NOT_ALLOWED!>class object { }<!>
+    }
+}
+
+class B {
+    class object {
+        class B {
+            class object {
+                class C {
+                    class object { }
+                }
+            }
+        }
+    }
+}
+