[ISSUE #8777] enhance error log when when can't connect to namesrv addrs

[juhuan]

Which Issue(s) This PR Fixes

Fixes #8777

Brief Description

How Did You Test This Change?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 47.38%. Comparing base (551c8c3) to head (abba5c3).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #8778   +/-   ##
==========================================
  Coverage      47.37%   47.38%           
+ Complexity     11558    11557    -1     
==========================================
  Files           1282     1282           
  Lines          89864    89864           
  Branches       11563    11563           
==========================================
+ Hits           42575    42579    +4     
+ Misses         42040    42032    -8     
- Partials        5249     5253    +4     

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