For #1920, refine rtmp listen ip and port check

[chen-guanghua]

refine rtmp listen ip and port check

[codecov-commenter]

Codecov Report

Merging #2581 (867a9c2) into 4.0release (714e182) will increase coverage by 0.01%.
The diff coverage is 95.65%.

@@              Coverage Diff               @@
##           4.0release    #2581      +/-   ##
==============================================
+ Coverage       59.39%   59.41%   +0.01%     
==============================================
  Files             122      122              
  Lines           51545    51565      +20     
==============================================
+ Hits            30616    30637      +21     
+ Misses          20929    20928       -1     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_config.cpp | 67.71% <83.33%> (-0.01%) | ⬇️ |
| trunk/src/kernel/srs_kernel_utility.cpp | 92.37% <100.00%> (+0.10%) | ⬆️ |
| trunk/src/utest/srs_utest_kernel.cpp | 98.50% <100.00%> (+<0.01%) | ⬆️ |
| trunk/src/protocol/srs_rtmp_handshake.cpp | 84.31% <0.00%> (+0.35%) | ⬆️ |

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Translated to English while maintaining the markdown structure:

'> Δ = absolute <relative> (impact), ø = not affected, ? = missing data

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