Bugfix/check gather return exceptions

[sanderegg]

What do these changes do?

• check returned exceptions from asyncio.gather
• check future exceptions using a callback fct on futures to check if an exception occured and report it
  based on ideas here

Related issue number

How to test

Checklist

• Did you change any service's API? Then make sure to bundle document and upgrade version (make openapi-specs, git commit ... and then make version-*)
• Unit tests for the changes exist
• Runs in the swarm
• Documentation reflects the changes
• New module? Add your github username to .github/CODEOWNERS

[codecov]

Codecov Report

Merging #1360 into master will decrease coverage by 0.08%.
The diff coverage is 72.97%.

@@            Coverage Diff             @@
##           master    #1360      +/-   ##
==========================================
- Coverage   72.75%   72.66%   -0.09%     
==========================================
  Files         201      201              
  Lines        8356     8414      +58     
  Branches      937      943       +6     
==========================================
+ Hits         6079     6114      +35     
- Misses       2005     2025      +20     
- Partials      272      275       +3

Flag	Coverage Δ
#integrationtests	57.55% <37.39%> (ø)	⬆️
#unittests	66.86% <66.89%> (-0.31%)	⬇️

Impacted Files	Coverage Δ
...erver/src/simcore_service_webserver/storage_api.py	58.82% <ø> (+23.52%)	⬆️
...tor/src/simcore_service_director/registry_proxy.py	69.43% <0%> (-0.73%)	⬇️
...r/src/simcore_service_webserver/socketio/events.py	100% <100%> (ø)	⬆️
...ackages/service-library/src/servicelib/observer.py	90% <100%> (ø)	⬆️
...simcore_service_webserver/projects/projects_api.py	81.41% <100%> (+0.74%)	⬆️
...webserver/computation_comp_tasks_listening_task.py	71.42% <14.28%> (-6.16%)	⬇️
packages/service-library/src/servicelib/utils.py	66.66% <47.61%> (-33.34%)	⬇️
...ce_webserver/resource_manager/garbage_collector.py	87.5% <50%> (+0.26%)	⬆️
.../simcore_service_webserver/computation_handlers.py	88% <63.63%> (-7.35%)	⬇️
...simcore_service_webserver/director/director_api.py	55% <66.66%> (-1.67%)	⬇️
... and 5 more

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[pcrespov]

Cool

[pcrespov]

Super