Fixes on webserver diagnostics submodule and setup in dev-mode

[pcrespov]

Fixes issues in master.
See commits

[codecov]

Codecov Report

Merging #1430 into master will decrease coverage by 10.99%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #1430     +/-   ##
=========================================
- Coverage   71.43%   60.43%    -11%     
=========================================
  Files         240      240             
  Lines        9512     9512             
  Branches     1044     1045      +1     
=========================================
- Hits         6795     5749   -1046     
- Misses       2413     3487   +1074     
+ Partials      304      276     -28

Flag	Coverage Δ
#integrationtests	58.53% <0%> (ø)	⬆️
#unittests	59% <ø> (-4.69%)	⬇️

Impacted Files	Coverage Δ
...imcore_service_webserver/diagnostics_monitoring.py	29.5% <0%> (-63.94%)	⬇️
...erver/src/simcore_service_webserver/rest_models.py	0% <0%> (-91.18%)	⬇️
...er/src/simcore_service_webserver/storage_routes.py	20% <0%> (-80%)	⬇️
...er/src/simcore_service_webserver/users_handlers.py	29.03% <0%> (-70.97%)	⬇️
...er/src/simcore_service_webserver/login/handlers.py	22.39% <0%> (-65.11%)	⬇️
...er/src/simcore_service_webserver/studies_access.py	24.46% <0%> (-63.83%)	⬇️
...src/simcore_service_webserver/activity/handlers.py	26.08% <0%> (-63.77%)	⬇️
...mcore_service_webserver/projects/projects_utils.py	14.81% <0%> (-62.97%)	⬇️
...rc/simcore_service_webserver/diagnostics_plugin.py	45.16% <0%> (-54.84%)	⬇️
...ver/src/simcore_service_webserver/rest_handlers.py	48% <0%> (-52%)	⬇️
... and 47 more

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[sanderegg]

pair reviewed