Fix payload_len calculation for DataPacket.

[Splinter1984]

This PR fix pl_len calculation issue for DataPacket of RTPS protocol.
Take into account the size of inlineQoS during payload length calculation.
Closes #4594

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 49.30%. Comparing base (6f0faf3) to head (998851c).
Report is 107 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/contrib/rtps/common_types.py	0.00%	2 Missing ⚠️
scapy/contrib/rtps/rtps.py	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (6f0faf3) and HEAD (998851c). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (6f0faf3)	HEAD (998851c)
	11	2

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4545       +/-   ##
===========================================
- Coverage   81.61%   49.30%   -32.32%     
===========================================
  Files         356      344       -12     
  Lines       85545    87083     +1538     
===========================================
- Hits        69819    42934    -26885     
- Misses      15726    44149    +28423     

Files with missing lines	Coverage Δ
scapy/contrib/rtps/rtps.py	85.71% <0.00%> (-13.11%)	⬇️
scapy/contrib/rtps/common_types.py	58.26% <0.00%> (-37.01%)	⬇️

... and 313 files with indirect coverage changes

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