add: 增加ini文件获取的兼容

src/Mysql/MysqlClusterBase.php

@@ -259,6 +259,14 @@ abstract class MysqlClusterBase
      */
     private static function getDbServerPort($type, $dbShardingIndex)
     {
+        if(empty(self::$iniConf)) {
+            //重新加载 ini
+            self::$iniConf = config('mysql', static::CONFIG_INDEX);
+            if (!self::$iniConf) {
+                throw new \Exception('mysql yaconf ini config not exist');
+            }
+        }
+
         $server = '';
         $port = 0;
         $host = self::$iniConf[$type]['host'];