split node names for machines that use full node address

[cms21]

This PR fixes serial mode on Polaris. The nodelist that serial mode would compare the local hostname to included the full node address, unlike the local hostname. We now split the node names and compare just the first part of the name to the local hostname.

[codecov-commenter]

Codecov Report

Patch coverage: 40.00% and project coverage change: +0.03 🎉

Comparison is base (9a02ef0) 60.89% compared to head (9f70b10) 60.92%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #358      +/-   ##
==========================================
+ Coverage   60.89%   60.92%   +0.03%     
==========================================
  Files         157      157              
  Lines        9609     9610       +1     
  Branches     1255     1255              
==========================================
+ Hits         5851     5855       +4     
+ Misses       3501     3496       -5     
- Partials      257      259       +2     

Impacted Files	Coverage Δ
balsam/_api/model.py	76.22% <0.00%> (ø)
balsam/config/config.py	81.37% <0.00%> (ø)
balsam/site/launcher/_serial_mode_worker.py	88.23% <66.66%> (-1.02%)	⬇️

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.