Complete hap_protocol coverage

[bdraco]

• Improves handling of client closing connection cleanly

[codecov]

Codecov Report

Merging #332 (ccf8ba4) into dev (87e9f4d) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #332      +/-   ##
==========================================
+ Coverage   90.43%   90.57%   +0.14%     
==========================================
  Files          19       19              
  Lines        1881     1889       +8     
  Branches      217      217              
==========================================
+ Hits         1701     1711      +10     
+ Misses        135      134       -1     
+ Partials       45       44       -1     

Impacted Files	Coverage Δ
pyhap/hap_protocol.py	100.00% <100.00%> (+1.62%)	⬆️

[bdraco]

@ikalchev That should be it for a while. At some point I'd like to add full coverage for pair and pair verify but thats for another day.

Tested and should be good to go for release.