HLS: Added delay cleanup old expired ts files

[mapengfei53]

Some player start to play from the first ts file, which might be cleanup. It's better to delay cleanup the ts files. issues #2999

[codecov-commenter]

Codecov Report

Merging #3001 (54852b5) into develop (2b2379d) will decrease coverage by 0.04%. The diff coverage is 3.77%.

:exclamation: Current head 54852b5 differs from pull request most recent head 895acf2. Consider uploading reports for the commit 895acf2 to get more accurate results

@@             Coverage Diff             @@
##           develop    #3001      +/-   ##
===========================================
- Coverage    56.10%   56.06%   -0.05%     
===========================================
  Files          153      153              
  Lines        57561    57609      +48     
===========================================
+ Hits         32294    32296       +2     
- Misses       25267    25313      +46     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | | |---|---|---| | trunk/src/app/srs_app_config.cpp | 65.38% <0.00%> (-0.18%) | :arrow_down: | | trunk/src/app/srs_app_config.hpp | 100.00% <ø> (ø) | |'

Translated to English while maintaining the markdown structure:

'| trunk/src/app/srs_app_config.hpp | 100.00% <ø> (ø) | | | trunk/src/app/srs_app_fragment.cpp | 11.90% <0.00%> (-0.30%) | :arrow_down: | | trunk/src/app/srs_app_hls.cpp | 0.00% <0.00%> (ø) | |'

Translated to English while maintaining the markdown structure:

'| trunk/src/app/srs_app_hls.cpp | 0.00% <0.00%> (ø) | | | trunk/src/app/srs_app_hybrid.cpp | 11.26% <5.88%> (-1.70%) | :arrow_down: |

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Legend - Click here to learn more | Δ = absolute <relative> (impact), ø = not affected, ? = missing data |

Translated to English while maintaining the markdown structure:

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

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