PR#1574 improved - Adds Extended Master Secret to TLS (RFC 7627)

[guedou]

This PR fixes conflict in #1574 and PEP-08 errors.

It still lacks unit tests.

[codecov]

Codecov Report

Merging #2403 into master will decrease coverage by 0.00%.
The diff coverage is 86.36%.

@@            Coverage Diff             @@
##           master    #2403      +/-   ##
==========================================
- Coverage   88.28%   88.27%   -0.01%     
==========================================
  Files         243      243              
  Lines       51011    51033      +22     
==========================================
+ Hits        45035    45050      +15     
- Misses       5976     5983       +7     

Impacted Files	Coverage Δ
scapy/layers/tls/crypto/prf.py	83.33% <66.66%> (-0.85%)	⬇️
scapy/layers/tls/session.py	78.21% <75.00%> (-0.03%)	⬇️
scapy/layers/tls/handshake.py	86.54% <100.00%> (+0.21%)	⬆️
scapy/autorun.py	69.28% <0.00%> (-3.58%)	⬇️
scapy/main.py	72.55% <0.00%> (-0.66%)	⬇️
scapy/contrib/isotp.py	91.45% <0.00%> (-0.09%)	⬇️
scapy/arch/windows/__init__.py	72.13% <0.00%> (+0.15%)	⬆️
scapy/arch/windows/native.py	79.24% <0.00%> (+0.94%)	⬆️
scapy/arch/pcapdnet.py	80.39% <0.00%> (+1.17%)	⬆️