Fix setup.py ASF issues

[bolkedebruin]

• This renames the package to apache-superset instead of superset.
  This is required.
• It sets the download location to the official ASF repositories

@mistercrunch @kristw

[codecov-io]

Codecov Report

Merging #6677 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #6677     +/-   ##
=========================================
+ Coverage   56.14%   56.24%   +0.1%     
=========================================
  Files         521      519      -2     
  Lines       23179    23088     -91     
  Branches     2769     2756     -13     
=========================================
- Hits        13014    12986     -28     
+ Misses       9756     9693     -63     
  Partials      409      409

Impacted Files	Coverage Δ
superset/assets/src/components/AsyncSelect.jsx	92.85% <0%> (-3.44%)	⬇️
superset/assets/src/addSlice/AddSliceContainer.jsx	70.83% <0%> (-1.9%)	⬇️
superset/views/datasource.py	93.1% <0%> (-1.35%)	⬇️
superset/data/country_map.py	27.58% <0%> (-0.54%)	⬇️
superset/connectors/druid/models.py	82.37% <0%> (-0.35%)	⬇️
superset/connectors/sqla/models.py	77.92% <0%> (-0.17%)	⬇️
superset/views/sql_lab.py	93.61% <0%> (-0.14%)	⬇️
superset/data/helpers.py	96.42% <0%> (-0.13%)	⬇️
superset/assets/src/components/EditableTitle.jsx	77.04% <0%> (-0.1%)	⬇️
superset/assets/src/components/Checkbox.jsx	100% <0%> (ø)	⬆️
... and 501 more

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[bolkedebruin]

ping @mistercrunch

[hughhhh]

@bolkedebruin can you rebase?

[mistercrunch]

LGTM

[bolkedebruin]

@kristw build failures were unrelated. Can this be merged?

[mistercrunch]

We actually cannot merge if CI doesn't pass :( We'd have to ask Apache infra to change the Github settings, but unclear if we want to allow this. Mind rebasing?

[kristw]

@mistercrunch Master CI breaks again. Something is strange with all CI that involves python.

[bolkedebruin]

Oh I like that actually ;-). Sure I can rebase. I’ll do that ASAP.

[bolkedebruin]

But probably you can merge from the command line. I don’t think github will interfere then

[mistercrunch]

We use Github's protected branch feature on master, can't push to it...

[bolkedebruin]

@mistercrunch done.