ft: support multiple storage classes

lib/models/ReplicationConfiguration.js

@@ -283,8 +283,10 @@ class ReplicationConfiguration {
     _parseStorageClass(destination) {
         const storageClass = destination.StorageClass &&
             destination.StorageClass[0];
+        const storageClassArr = storageClass.split(',');
+
         if (!this._config) {
-            return validStorageClasses.includes(storageClass);
+            return storageClassArr.every(i => validStorageClasses.includes(i));
         }
         const replicationEndpoints = this._config.replicationEndpoints
             .map(endpoint => endpoint.site);
@@ -304,7 +306,6 @@ class ReplicationConfiguration {
             !validStorageClasses.includes(storageClass)) {
             return errors.MalformedXML;
         }
-        this._prevStorageClass = storageClass;
         return undefined;
     }
 
@@ -357,7 +358,7 @@ class ReplicationConfiguration {
         if (!dest) {
             return errors.MalformedXML;
         }
-        const err = this._parseBucket(dest) || this._parseStorageClass(dest);
+        const err = this._parseBucket(dest) || this._parseStorageClasses(dest);
         if (err) {
             return err;
         }