feat: change default uc host

Author: lihsai0

src/Qiniu/Storage/Config.cs

@@ -14,7 +14,7 @@ public class Config
         /// <summary>
         /// 默认空间管理域名
         /// </summary>
-        public static string DefaultUcHost = "uc.qbox.me";
+        public static string DefaultUcHost = "uc.qiniuapi.com";
         /// <summary>
         /// 默认查询区域域名
         /// </summary>

src/QiniuTests/Storage/ConfigTests.cs

@@ -11,15 +11,15 @@ public void UcHostTest()
         {
             Config config = new Config();
             string ucHost = config.UcHost();
-            Assert.AreEqual("http://uc.qbox.me", ucHost);
+            Assert.AreEqual("http://uc.qiniuapi.com", ucHost);
             config.SetUcHost("uc.example.com");
             ucHost = config.UcHost();
             Assert.AreEqual("http://uc.example.com", ucHost);
 
             config = new Config();
             config.UseHttps = true;
             ucHost = config.UcHost();
-            Assert.AreEqual("https://uc.qbox.me", ucHost);
+            Assert.AreEqual("https://uc.qiniuapi.com", ucHost);
             config.SetUcHost("uc.example.com");
             ucHost = config.UcHost();
             Assert.AreEqual("https://uc.example.com", ucHost);