Fix the suboptimal performance in multipath transmission caused by pa…

[Thuwzq]

resolve #358

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.79%. Comparing base (04e656c) to head (ab17b4a).

Files	Patch %	Lines
src/multipath_scheduler/scheduler_rr.rs	80.00%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #359      +/-   ##
===========================================
- Coverage    95.19%   94.79%   -0.40%     
===========================================
  Files           50       50              
  Lines        33901    33894       -7     
===========================================
- Hits         32272    32131     -141     
- Misses        1629     1763     +134     

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