Feature/socket

[marioncottard]

Draft implementation of socketIO connections. Related to #505

[marioncottard]

@ampuerin, in order for this to work, I had to replace gevent workers by GeventWebSocketWorkers, from the gevent-websocket library. I also added a monkey patch. None of those seem to be causing any problem in local with docker, but do you think those changes could have an influence on production deployments?

[codecov]

Codecov Report

Attention: Patch coverage is 50.73529% with 67 lines in your changes missing coverage. Please review.

Project coverage is 75.09%. Comparing base (a34a01d) to head (ba3b785).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #580      +/-   ##
===========================================
- Coverage    75.29%   75.09%   -0.20%     
===========================================
  Files          258      262       +4     
  Lines        14430    14560     +130     
  Branches      2078     2007      -71     
===========================================
+ Hits         10865    10934      +69     
- Misses        3104     3169      +65     
+ Partials       461      457       -4     

Flag	Coverage Δ
client-tests	77.72% <ø> (ø)
dags-tests	77.58% <39.39%> (-0.17%)	⬇️
server-tests	77.47% <54.36%> (-0.42%)	⬇️

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Components	Coverage Δ
server	77.47% <54.36%> (-0.42%)	⬇️
client	77.72% <ø> (ø)
dags	77.58% <39.39%> (-0.17%)	⬇️