新增追加文件方法、查询短信发送记录方法和修复扩展状态码对error信息处理

[yangjunren]

1、uploader.py 文件中新增了 append_file 追加文件方法，并在 test_qiniu.py 中添加了对应测试用例。
2、sms.py 文件中新增了 get_messages_info 查询短信发送记录方法。
3、修改 http.py 文件中 扩展状态码对error信息处理，主要用于兼容Dora中响应体中没有error字段信息的问题。

[codecov]

Codecov Report

Merging #378 into master will increase coverage by 0.53%.
The diff coverage is 71.01%.

@@            Coverage Diff             @@
##           master     #378      +/-   ##
==========================================
+ Coverage   66.58%   67.12%   +0.53%     
==========================================
  Files          20       20              
  Lines        1691     1740      +49     
==========================================
+ Hits         1126     1168      +42     
- Misses        565      572       +7     

Impacted Files	Coverage Δ
qiniu/services/sms/sms.py	22.22% <6.66%> (+0.42%)	⬆️
qiniu/http.py	60.91% <72.72%> (+0.20%)	⬆️
qiniu/services/storage/uploader.py	85.39% <90.62%> (+1.14%)	⬆️
qiniu/__init__.py	100.00% <100.00%> (ø)
test_qiniu.py	93.43% <100.00%> (+0.13%)	⬆️

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