[ISSUE #6910] Extract the interval of fetchNameServerAddr

[totalo]

Fix #6910

[mxsm]

@totalo Use fix #xxxx to link issue

[totalo]

@totalo Use fix #xxxx to link issue

done.

[mxsm]

LGTM

[codecov-commenter]

Codecov Report

Merging #6912 (a4f8372) into develop (4e09a9c) will increase coverage by 0.04%.
The diff coverage is 40.00%.

@@              Coverage Diff              @@
##             develop    #6912      +/-   ##
=============================================
+ Coverage      42.61%   42.65%   +0.04%     
- Complexity      9173     9185      +12     
=============================================
  Files           1131     1131              
  Lines          80225    80227       +2     
  Branches       10469    10465       -4     
=============================================
+ Hits           34184    34222      +38     
+ Misses         41767    41732      -35     
+ Partials        4274     4273       -1     

Impacted Files	Coverage Δ
...a/org/apache/rocketmq/broker/BrokerController.java	43.97% <0.00%> (ø)
...ava/org/apache/rocketmq/common/BrokerIdentity.java	40.67% <ø> (ø)
...org/apache/rocketmq/container/BrokerContainer.java	53.48% <0.00%> (-0.25%)	⬇️
.../java/org/apache/rocketmq/common/BrokerConfig.java	27.30% <25.00%> (-0.02%)	⬇️
...ache/rocketmq/container/BrokerContainerConfig.java	89.65% <75.00%> (-2.35%)	⬇️

... and 23 files with indirect coverage changes

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