Add aix73-power

[yachub]

It's worth noting that I intentionally left off the packaging_platform value override for 7.3 that was previously done for 7.2. I think that the packaging platform should default to same version, but if it needs overridden, then that can simply be done at build time.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (93900ce) 0.72% compared to head (a677aa7) 0.72%.

❗ Current head a677aa7 differs from pull request most recent head 2851073. Consider uploading reports for the commit 2851073 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #338      +/-   ##
=========================================
- Coverage    0.72%   0.72%   -0.01%     
=========================================
  Files          15      15              
  Lines        1788    1789       +1     
=========================================
  Hits           13      13              
- Misses       1775    1776       +1     

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

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