Clean up Ctrip related codes

[klboke]

What's the purpose of this PR

Clean up Ctrip related codes

[codecov-commenter]

Codecov Report

Merging #4448 (2b747f7) into master (5ab705d) will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4448      +/-   ##
============================================
+ Coverage     53.44%   53.51%   +0.07%     
+ Complexity     2692     2689       -3     
============================================
  Files           490      488       -2     
  Lines         15267    15229      -38     
  Branches       1588     1587       -1     
============================================
- Hits           8159     8150       -9     
+ Misses         6552     6523      -29     
  Partials        556      556              

Impacted Files	Coverage Δ
...m/ctrip/framework/apollo/biz/config/BizConfig.java	26.78% <ø> (+0.92%)	⬆️
...work/apollo/biz/message/DatabaseMessageSender.java	50.00% <0.00%> (-14.59%)	⬇️
.../apollo/internals/RemoteConfigLongPollService.java	77.24% <0.00%> (-1.20%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5ab705d...2b747f7. Read the comment docs.

[nobodyiam]

LGTM