Remove install_puppet_agent_* methods

[ekohl]

These were moved to beaker-puppet, but weren't removed here. They are also Puppetlabs specific, so don't belong in beaker itself.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.44 ⚠️

Comparison is base (75d952a) 74.82% compared to head (1eb3e3a) 74.38%.

❗ Current head 1eb3e3a differs from pull request most recent head cdaedad. Consider uploading reports for the commit cdaedad to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1775      +/-   ##
==========================================
- Coverage   74.82%   74.38%   -0.44%     
==========================================
  Files          82       82              
  Lines        4742     4606     -136     
==========================================
- Hits         3548     3426     -122     
+ Misses       1194     1180      -14     

Impacted Files	Coverage Δ
lib/beaker/host/eos.rb	100.00% <ø> (ø)
lib/beaker/host/mac/pkg.rb	42.10% <ø> (-30.45%)	⬇️
lib/beaker/host/unix/pkg.rb	50.86% <ø> (-17.00%)	⬇️
lib/beaker/host/windows/pkg.rb	73.91% <ø> (+26.41%)	⬆️

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