[AIRFLOW-2240] [dask] Added TLS/SSL support for the dask-distributed scheduler.

[mariusvniekerk]

As of 0.17.0 dask distributed has support for TLS/SSL.

[codecov-io]

Codecov Report

Merging #2683 into master will increase coverage by 0.55%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #2683      +/-   ##
==========================================
+ Coverage   72.98%   73.53%   +0.55%     
==========================================
  Files         180      191      +11     
  Lines       12654    14353    +1699     
==========================================
+ Hits         9235    10555    +1320     
- Misses       3419     3798     +379

Impacted Files	Coverage Δ
airflow/executors/dask_executor.py	2% <0%> (-0.33%)	⬇️
airflow/utils/db.py	34.42% <0%> (-2.42%)	⬇️
airflow/configuration.py	82.57% <0%> (-2.41%)	⬇️
airflow/models.py	87.25% <0%> (-0.08%)	⬇️
airflow/settings.py	81.9% <0%> (ø)	⬆️
airflow/exceptions.py	100% <0%> (ø)	⬆️
airflow/www/views.py	71.7% <0%> (ø)	⬆️
airflow/www_rbac/views.py	72.41% <0%> (ø)
airflow/www_rbac/forms.py	100% <0%> (ø)
airflow/www_rbac/utils.py	66.21% <0%> (ø)
... and 14 more

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[mariusvniekerk]

ping @bolkedebruin

[mrocklin]

Checking in here. Is there anything blocking this PR?

[artwr]

@mariusvniekerk LGTM, a test would be nice though.
Could you also change your commit to mention the JIRA number associated with it?

[mariusvniekerk]

Updated title

[mrocklin]

@mariusvniekerk Dask has some testing infrastructure to set up a local cluster with TLS active. See example here: https://github.com/dask/distributed/blob/master/distributed/tests/test_tls_functional.py#L23

[artwr]

We'll wait until CI passes, but looks good to me +1

[mariusvniekerk]

@artwr ping

[artwr]

LGTM, thank you!