Fix wrong redis key

[GitHK]

What do these changes do?

• Fixes an issue where registry keys were created in a wrong manner
• Improves Pylint testing run by pytest. It will now display some meaningful error upon fail
• Refactors pylint testing utils, which now get imported from the common pytest-simcore library

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 #1504 into master will decrease coverage by 18.72%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1504       +/-   ##
===========================================
- Coverage   71.28%   52.55%   -18.73%     
===========================================
  Files         247       32      -215     
  Lines        9969      666     -9303     
  Branches     1096       33     -1063     
===========================================
- Hits         7106      350     -6756     
+ Misses       2550      310     -2240     
+ Partials      313        6      -307     

Flag	Coverage Δ
#integrationtests	?
#unittests	?

Impacted Files	Coverage Δ
...rver/src/simcore_service_webserver/tag_handlers.py
...simcore_service_webserver/director/director_api.py
...rc/simcore_service_webserver/application_config.py
...er/src/simcore_service_webserver/login/handlers.py
...ges/service-library/src/servicelib/celery_utils.py
...s/web/server/src/simcore_service_webserver/rest.py
.../server/src/simcore_service_webserver/login/cfg.py
.../sidecar/src/simcore_service_sidecar/exceptions.py
.../web/server/src/simcore_service_webserver/email.py
...mcore_service_webserver/projects/nodes_handlers.py
... and 203 more

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[sanderegg]

very good go ahead

[pcrespov]

MINOR: let's try to add types when it is clear. We are slowly adopting this among other things to user http://mypy-lang.org/

[sanderegg]

very nice additions! go ahead!