Remove deprecated genconfig2 script

[ekohl]

While the warning suggested it would be removed in 1.x, we're already at 1.12 so there should have been plenty of time.

[codecov]

Codecov Report

Base: 0.52% // Head: 0.50% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (0cd16f1) compared to base (afd6f05).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head 0cd16f1 differs from pull request most recent head 29b6d5a. Consider uploading reports for the commit 29b6d5a to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #269      +/-   ##
=========================================
- Coverage    0.52%   0.50%   -0.02%     
=========================================
  Files          14      15       +1     
  Lines        2485    2565      +80     
=========================================
  Hits           13      13              
- Misses       2472    2552      +80     

Impacted Files	Coverage Δ
lib/beaker-hostgenerator/data.rb	0.00% <0.00%> (ø)
lib/beaker-hostgenerator/hypervisor.rb	0.00% <0.00%> (ø)
lib/beaker-hostgenerator/hypervisor/docker.rb	0.00% <0.00%> (ø)
lib/beaker-hostgenerator/hypervisor/hcloud.rb	0.00% <0.00%> (ø)

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[smortex]

LGTM 😄

[bastelfreak]

same as #236

[ekohl]

I should have checked that before.