Cleanup 802.11 RSN and MicrosoftWPA

[gpotter2]

• fix Inaccurate parsing of 802.11 element "RSN Information" #2683
• fix support of group management cipher suite in Dot11EltRSN #2600

[codecov]

Codecov Report

Merging #2694 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2694      +/-   ##
==========================================
+ Coverage   88.22%   88.29%   +0.06%     
==========================================
  Files         251      251              
  Lines       53275    53284       +9     
==========================================
+ Hits        47001    47045      +44     
+ Misses       6274     6239      -35     

Impacted Files	Coverage Δ
scapy/layers/dot11.py	91.88% <100.00%> (+0.16%)	⬆️
scapy/arch/windows/__init__.py	70.60% <0.00%> (+0.15%)	⬆️
scapy/sendrecv.py	86.73% <0.00%> (+0.16%)	⬆️
scapy/layers/inet.py	73.94% <0.00%> (+0.16%)	⬆️
scapy/layers/tls/handshake.py	83.15% <0.00%> (+0.36%)	⬆️
scapy/layers/tls/basefields.py	85.90% <0.00%> (+0.67%)	⬆️
scapy/layers/tls/keyexchange.py	83.64% <0.00%> (+1.22%)	⬆️
scapy/layers/tls/record.py	90.38% <0.00%> (+1.37%)	⬆️
scapy/layers/tls/crypto/pkcs1.py	75.91% <0.00%> (+1.45%)	⬆️
scapy/layers/tls/record_sslv2.py	87.70% <0.00%> (+1.67%)	⬆️
... and 2 more