[improve][admin] Print error log if handle http response fails

[poorbarcode]

Motivation

When users are calling pulsar-admin API, and there is an internal error( such as a deserialize JSON error), there is no error log.

You can test it this way:

• add a method getMsgRateIn() for TopicStatsImpl, and return a String value(such as abc), which will make the response.msgRateIn as a String value abc.
• call pulsar-admin topics stats
  • You will get nothing, and no error log is printed.

Modifications

Print error log if handle HTTP response fails

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: x

[lhotari]

LGTM

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.33%. Comparing base (bbc6224) to head (368653b).
Report is 714 commits behind head on master.

Files with missing lines	Patch %	Lines
...client/admin/internal/http/AsyncHttpConnector.java	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #23563      +/-   ##
============================================
+ Coverage     73.57%   74.33%   +0.75%     
- Complexity    32624    34327    +1703     
============================================
  Files          1877     1943      +66     
  Lines        139502   147056    +7554     
  Branches      15299    16210     +911     
============================================
+ Hits         102638   109310    +6672     
- Misses        28908    29327     +419     
- Partials       7956     8419     +463     

Flag	Coverage Δ
inttests	27.65% <50.00%> (+3.07%)	⬆️
systests	24.37% <50.00%> (+0.04%)	⬆️
unittests	73.72% <50.00%> (+0.87%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...client/admin/internal/http/AsyncHttpConnector.java	85.15% <50.00%> (-1.27%)	⬇️

... and 655 files with indirect coverage changes