[Test][MAINT] Splitting ListenCallback test into 3 separate tests, fixed proper setup/teardown

[ethouris]

Fixes #1306

[codecov-commenter]

Codecov Report

Merging #2556 (ec3c6c3) into master (6d62096) will decrease coverage by 0.09%.
The diff coverage is 96.00%.

@@            Coverage Diff             @@
##           master    #2556      +/-   ##
==========================================
- Coverage   65.95%   65.85%   -0.10%     
==========================================
  Files         100      100              
  Lines       19777    19841      +64     
==========================================
+ Hits        13043    13066      +23     
- Misses       6734     6775      +41     

Impacted Files	Coverage Δ
test/test_listen_callback.cpp	68.79% <96.00%> (-19.52%)	⬇️
srtcore/list.cpp	79.13% <0.00%> (-2.99%)	⬇️
srtcore/buffer_snd.cpp	67.10% <0.00%> (-0.66%)	⬇️
test/test_bonding.cpp	97.89% <0.00%> (-0.53%)	⬇️
srtcore/core.cpp	59.90% <0.00%> (-0.17%)	⬇️
srtcore/api.cpp	53.28% <0.00%> (+0.05%)	⬆️
srtcore/congctl.cpp	81.86% <0.00%> (+1.03%)	⬆️
srtcore/queue.cpp	81.00% <0.00%> (+1.18%)	⬆️
srtcore/cache.h	83.07% <0.00%> (+3.07%)	⬆️
... and 1 more

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