garbage collector system overhaul and extras

[GitHK]

Changes overview

This is a massive overhaul of the Garbage Collector code, which was outdated.

Due to its complexity, comments on its internal workings were added in the garbage_collector.py module

What do these changes do?

• Previously the garbage collector was not able to remove a GUEST user which had no projects.
• Fixes the issue of having guest users without projects in master
• GC implementation has been refactored to keep access rights in mind
• added extensive docstrings to all functions in the garbage_collector module which explain the logic behind its workings
• adds tests to check the correct removal of GUEST users and their associated projects

Bonus changes:

• changelog now links PRs
• logs from aiohttp apps will now show during tests with options -vvvand -s
• nvidia/cuda:10.0-base container used by the sidecar is now removed after usage
• it is now possible to test in isolation with template databases, after each test is run, the DB will be dropped and recreated from the template. This avoids the overhead of applying all the migrations each time. For now this is only enabled in the test_garbage_collection.py module

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 #1724 into master will increase coverage by 2.1%.
The diff coverage is 80.8%.

@@           Coverage Diff            @@
##           master   #1724     +/-   ##
========================================
+ Coverage    70.2%   72.4%   +2.1%     
========================================
  Files         305     306      +1     
  Lines       11778   11886    +108     
  Branches     1272    1285     +13     
========================================
+ Hits         8274    8608    +334     
+ Misses       3179    2928    -251     
- Partials      325     350     +25     

Flag	Coverage Δ
#integrationtests	58.6% <76.7%> (+2.3%)	⬆️
#unittests	66.0% <52.2%> (-0.3%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...gres-database/src/simcore_postgres_database/cli.py	0.0% <0.0%> (ø)
...ce_webserver/resource_manager/garbage_collector.py	72.8% <77.7%> (+3.2%)	⬆️
...server/src/simcore_service_webserver/groups_api.py	89.3% <100.0%> (+0.3%)	⬆️
.../simcore_service_webserver/projects/projects_db.py	84.4% <100.0%> (+0.9%)	⬆️
...ore_service_webserver/resource_manager/__init__.py	100.0% <100.0%> (ø)
...src/simcore_service_webserver/socketio/handlers.py	82.6% <100.0%> (ø)
.../server/src/simcore_service_webserver/users_api.py	93.9% <100.0%> (+0.2%)	⬆️
...c/simcore_service_webserver/users_to_groups_api.py	100.0% <100.0%> (ø)
.../director/src/simcore_service_director/producer.py	60.1% <0.0%> (-0.5%)	⬇️
... and 10 more

[sanderegg]

great! go in!
for the testing I do not see any change in speed between here and there
but maybe we can use these in // soon.