Various linting fixes

[cyberw]

No description provided.

[codecov]

Codecov Report

Merging #1549 into master will increase coverage by 0.23%.
The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master    #1549      +/-   ##
==========================================
+ Coverage   82.03%   82.26%   +0.23%     
==========================================
  Files          28       28              
  Lines        2566     2566              
  Branches      391      391              
==========================================
+ Hits         2105     2111       +6     
+ Misses        362      356       -6     
  Partials       99       99              

Impacted Files	Coverage Δ
locust/argument_parser.py	77.19% <ø> (ø)
locust/contrib/fasthttp.py	85.91% <ø> (ø)
locust/event.py	87.50% <ø> (ø)
locust/main.py	21.05% <0.00%> (ø)
locust/user/task.py	97.29% <ø> (+0.54%)	⬆️
locust/web.py	91.37% <ø> (ø)
locust/runners.py	82.54% <50.00%> (+0.94%)	⬆️
locust/stats.py	90.68% <100.00%> (ø)
locust/user/users.py	95.83% <100.00%> (ø)
... and 1 more

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