check parent domains for flex routing

bubble-server/src/main/java/bubble/rule/AppRuleDriver.java

@@ -81,9 +81,14 @@ public interface AppRuleDriver {
 
     static boolean isFlexRouteFqdn(RedisService redis, String ip, String fqdn) {
         final String key = REDIS_FLEX_LISTS + "~" + ip + REDIS_LIST_SUFFIX;
-        final boolean found = redis.sismember_plaintext(key, fqdn);
-        if (log.isErrorEnabled()) log.error("isFlexRouteFqdn("+ip+", "+fqdn+") == "+found+ "(key="+key+")");
-        return found;
+        String check = fqdn;
+        while (true) {
+            final boolean found = redis.sismember_plaintext(key, check);
+            if (found) return true;
+            final int dotPos = check.indexOf('.');
+            check = check.substring(dotPos+1);
+            if (!check.contains(".")) return false;
+        }
     }
 
     AppRuleDriver getNext();