ensure that failed tasks fail the workload - if so configured

[andre-merzky]

This fixes #669

[codecov]

Codecov Report

Attention: Patch coverage is 52.38095% with 10 lines in your changes missing coverage. Please review.

Project coverage is 71.43%. Comparing base (b001af2) to head (edf205e).

Files	Patch %	Lines
src/radical/entk/execman/rp/task_manager.py	0.00%	5 Missing ⚠️
src/radical/entk/appman/wfprocessor.py	75.00%	3 Missing ⚠️
src/radical/entk/appman/appmanager.py	50.00%	1 Missing ⚠️
src/radical/entk/execman/rp/task_processor.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #670      +/-   ##
==========================================
- Coverage   71.68%   71.43%   -0.25%     
==========================================
  Files          26       26              
  Lines        2313     2321       +8     
==========================================
  Hits         1658     1658              
- Misses        655      663       +8     

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[mtitov]

LGTM!