Make no-conf apply to isolate config as well

[ranaldmiao]

Currently, when running sudo python3 prerequisites.py install --no-conf, configuration files for isolate will be re-installed.

This PR introduces a change for --no-conf to also be applied to isolate configuration files.
When --no-conf argument is provided, isolate configuration files will not be installed.

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This change is 

[codecov]

Codecov Report

Merging #1175 (ccf69c7) into master (98cf097) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1175      +/-   ##
==========================================
+ Coverage   63.64%   63.70%   +0.05%     
==========================================
  Files         232      232              
  Lines       17046    17046              
==========================================
+ Hits        10849    10859      +10     
+ Misses       6197     6187      -10     

Flag	Coverage Δ
functionaltests	47.59% <ø> (+0.01%)	⬆️
unittests	44.13% <ø> (ø)

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

Impacted Files	Coverage Δ
cms/server/contest/handlers/contest.py	86.40% <0.00%> (-3.89%)	⬇️
cms/server/contest/handlers/tasksubmission.py	48.63% <0.00%> (-1.64%)	⬇️
cms/service/workerpool.py	70.00% <0.00%> (-1.12%)	⬇️
cms/db/fsobject.py	76.51% <0.00%> (-0.76%)	⬇️
cms/db/submission.py	97.93% <0.00%> (-0.52%)	⬇️
cms/io/rpc.py	93.19% <0.00%> (-0.35%)	⬇️
cms/db/filecacher.py	77.41% <0.00%> (ø)
cms/server/admin/handlers/base.py	69.63% <0.00%> (+0.66%)	⬆️
cms/grading/Job.py	90.17% <0.00%> (+0.89%)	⬆️
cms/service/ProxyService.py	68.68% <0.00%> (+1.01%)	⬆️
... and 4 more

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[andreyv]

Thanks.

The general idea is good, but I think it breaks the

./prerequisites.py install_isolate

subcommand. This should be easy to fix, though.

[ranaldmiao]

Thanks.

The general idea is good, but I think it breaks the

./prerequisites.py install_isolate

subcommand. This should be easy to fix, though.

Good point, let me fix that and update you