Fix/flux startup

[andre-merzky]

No description provided.

[mtitov]

LGTM!

[codecov]

Codecov Report

Attention: Patch coverage is 4.65116% with 41 lines in your changes missing coverage. Please review.

Project coverage is 62.40%. Comparing base (8a9ca1b) to head (07b56d7).
Report is 216 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/radical/utils/flux.py	2.70%	36 Missing ⚠️
src/radical/utils/heartbeat.py	0.00%	3 Missing ⚠️
src/radical/utils/zmq/utils.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #396      +/-   ##
==========================================
+ Coverage   61.69%   62.40%   +0.71%     
==========================================
  Files          61       61              
  Lines        6840     6754      -86     
==========================================
- Hits         4220     4215       -5     
+ Misses       2620     2539      -81     

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