Allow dots & dashes in cumulus prompt username

[ktims]

Pre-Request Checklist

• [*] Passes rubocop code analysis (try rubocop --auto-correct)
• [-] Tests added or adapted (try rake test)
• [-] Changes are reflected in the documentation
• [-] User-visible changes appended to CHANGELOG.md

Description

Adjust prompt regex to behave correctly when the username portion includes a - or . which are valid characters in Linux usernames but not included in the \w regex shorthand.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.65% 🎉

Comparison is base (5075488) 65.90% compared to head (058d42b) 66.55%.

❗ Current head 058d42b differs from pull request most recent head ca70250. Consider uploading reports for the commit ca70250 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2870      +/-   ##
==========================================
+ Coverage   65.90%   66.55%   +0.65%     
==========================================
  Files          30       30              
  Lines        1525     1507      -18     
==========================================
- Hits         1005     1003       -2     
+ Misses        520      504      -16     

see 1 file with indirect coverage changes

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[mortzu]

Please update CHANGELOG.md

[ktims]

@mortzu updated!