Summer2021 support more format

[lepdou]

What's the purpose of this PR

1. remove useless code
2. add change log
3. fix failed ut

Which issue(s) this PR fixes:

#3815

Brief changelog

remove useless code and add change log

Follow this checklist to help us incorporate your contribution quickly and easily:

• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
• Run mvn clean test to make sure this pull request doesn't break anything.
• Update the CHANGES log.

[github-actions]

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[codecov-commenter]

Codecov Report

Merging #3871 (41019b6) into master (7afe23b) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3871      +/-   ##
============================================
+ Coverage     50.11%   50.14%   +0.03%     
  Complexity     2464     2464              
============================================
  Files           483      483              
  Lines         14921    14919       -2     
  Branches       1520     1519       -1     
============================================
+ Hits           7477     7481       +4     
+ Misses         6914     6910       -4     
+ Partials        530      528       -2     

Impacted Files	Coverage Δ
...ork/apollo/portal/service/AppNamespaceService.java	75.00% <ø> (-0.56%)	⬇️
.../apollo/internals/RemoteConfigLongPollService.java	78.31% <0.00%> (+0.60%)	⬆️
...mework/apollo/portal/component/PortalSettings.java	65.62% <0.00%> (+7.81%)	⬆️

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[lepdou]

recheck

[lepdou]

recheck