Rubocop: fix more violations

[bastelfreak]

No description provided.

[codecov]

Codecov Report

Patch coverage: 70.58% and project coverage change: +0.41 🎉

Comparison is base (ee95956) 85.96% compared to head (37de7a8) 86.37%.

❗ Current head 37de7a8 differs from pull request most recent head d29bed3. Consider uploading reports for the commit d29bed3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   85.96%   86.37%   +0.41%     
==========================================
  Files           1        1              
  Lines         285      279       -6     
==========================================
- Hits          245      241       -4     
+ Misses         40       38       -2     

Impacted Files	Coverage Δ
lib/beaker/hypervisor/docker.rb	86.37% <70.58%> (+0.41%)	⬆️

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