Add rzgenie and poodle to llnl-cluster

[michaelmckinsey1]

Description

• Migrate system changes from RAJAPerf Data Gen #1050
• Add new cluster definitions

Adding/modifying a system (docs: Adding a System)

• Update systems/llnl-cluster, systems/llnl-elcapitan, systems/llnl-sierra

[michaelmckinsey1]

Failing CI because #1042

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.33%. Comparing base (b1c2293) to head (4d5e252).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1123      +/-   ##
===========================================
+ Coverage    65.20%   65.33%   +0.12%     
===========================================
  Files           44       44              
  Lines         3245     3245              
  Branches       257      257              
===========================================
+ Hits          2116     2120       +4     
+ Misses        1122     1118       -4     
  Partials         7        7              

Files with missing lines	Coverage Δ
systems/llnl-elcapitan/system.py	35.46% <ø> (ø)

... and 1 file with indirect coverage changes

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