delete useless code

Author: YangSen-qn

src/test/java/test/com/qiniu/storage/BucketTest.java

@@ -6,9 +6,7 @@
 import com.qiniu.http.Response;
 import com.qiniu.storage.BucketManager;
 import com.qiniu.storage.Configuration;
-import com.qiniu.storage.Region;
 import com.qiniu.storage.model.*;
-import com.qiniu.util.Auth;
 import com.qiniu.util.Json;
 import com.qiniu.util.StringUtils;
 import okhttp3.Call;