Add new validity state for games unranked by host

Author: Brutus5000

src/main/java/com/faforever/api/data/domain/Validity.java

@@ -26,5 +26,6 @@ public enum Validity {
   WRONG_DIFFICULTY,
   EXPANSION_DISABLED,
   SPAWN_NOT_FIXED,
-  OTHER_UNRANK
+  OTHER_UNRANK,
+  UNRANKED_BY_HOST
 }