Change Hyphens to Underscores to Match Spack1.0 Syntax

[michaelmckinsey1]

Description

• Spack package naming syntax changed from "-" to "_" in spack1.0, so updating our package names.

Adding/modifying a benchmark (docs: Adding a Benchmark)

• repo/*

[michaelmckinsey1]

I thought this would work but

==> Warning: while setting up external spec cray-mpich@=9.0.1+gtl+wrappers %cce@20.0.0: No such variant 'gtl' in package cray-mpich
==> Error: No such variant 'gtl' in package cray-mpich

[michaelmckinsey1]

Update: this PR is waiting until @scheibelp gets a chance to take a look.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.43%. Comparing base (dd1b469) to head (827f476).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1091   +/-   ##
========================================
  Coverage    65.43%   65.43%           
========================================
  Files           44       44           
  Lines         3240     3240           
  Branches       256      256           
========================================
  Hits          2120     2120           
  Misses        1113     1113           
  Partials         7        7           

Files with missing lines	Coverage Δ
systems/llnl-elcapitan/system.py	36.29% <ø> (ø)

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[michaelmckinsey1]

dryruns should at least be passing now (I tested locally). Not sure about gitlab tests