stop get host when get one from region

Author: YangSen-qn

QiniuSDK/Http/ServerRegion/QNUploadDomainRegion.m

@@ -242,6 +242,10 @@ - (NSDictionary *)createDomainDictionary:(NSArray <NSString *> *)hosts{
                 return [QNUploadServerNetworkStatus isServerNetworkBetter:filterServer thanServerB:serverP];
             }];
             server = [QNUploadServerNetworkStatus getBetterNetworkServer:server serverB:domainServer];
+            
+            if (server) {
+                break;
+            }
         }
 
         if (server) {
@@ -269,6 +273,10 @@ - (NSDictionary *)createDomainDictionary:(NSArray <NSString *> *)hosts{
             return [QNUploadServerNetworkStatus isServerNetworkBetter:filterServer thanServerB:serverP];
         }];
         server = [QNUploadServerNetworkStatus getBetterNetworkServer:server serverB:domainServer];
+        
+        if (server) {
+            break;
+        }
     }
 
     // 3. 无可用 server 且未冻结过 Host 则随机获取一个