allow launcher command for flux startup

[andre-merzky]

No description provided.

[mtitov]

LGTM! Thanx!

[codecov]

Codecov Report

Attention: Patch coverage is 44.00000% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 62.02%. Comparing base (3a782df) to head (42a7eb1).

❗ Current head 42a7eb1 differs from pull request most recent head c43e7e5. Consider uploading reports for the commit c43e7e5 to get more accurate results

Files	Patch %	Lines
src/radical/utils/env.py	50.00%	8 Missing ⚠️
src/radical/utils/flux.py	25.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #402      +/-   ##
==========================================
- Coverage   62.26%   62.02%   -0.25%     
==========================================
  Files          61       61              
  Lines        6777     6783       +6     
==========================================
- Hits         4220     4207      -13     
- Misses       2557     2576      +19     

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