Add HTTP Basic Auth for Druid (Issue #4776)

[donbowman]

This should resolve Issue #4776

Add HTTP Basic Auth to the Druid Broker.

Screenshot of change:

Signed-off-by: Don Bowman don@agilicus.com

[codecov-io]

Codecov Report

Merging #6795 into master will increase coverage by 1.49%.
The diff coverage is 44.44%.

@@            Coverage Diff             @@
##           master    #6795      +/-   ##
==========================================
+ Coverage   63.84%   65.33%   +1.49%     
==========================================
  Files         421      422       +1     
  Lines       20445    21455    +1010     
  Branches     2218     2314      +96     
==========================================
+ Hits        13053    14018     +965     
- Misses       7260     7308      +48     
+ Partials      132      129       -3

Impacted Files	Coverage Δ
superset/connectors/druid/views.py	66.21% <ø> (-1.37%)	⬇️
superset/connectors/druid/models.py	82.51% <44.44%> (-0.21%)	⬇️
superset/common/query_context.py	22.4% <0%> (-67.6%)	⬇️
superset/common/query_object.py	28.26% <0%> (-66.98%)	⬇️
superset/views/api.py	68.57% <0%> (-20.91%)	⬇️
...rset/assets/src/explore/reducers/exploreReducer.js	35.71% <0%> (-12.57%)	⬇️
...erset/assets/src/dashboard/reducers/datasources.js	57.14% <0%> (-9.53%)	⬇️
...rc/dashboard/components/dnd/dragDroppableConfig.js	29.16% <0%> (-5.84%)	⬇️
...ts/src/dashboard/components/gridComponents/Tab.jsx	66.66% <0%> (-5.75%)	⬇️
...src/explore/components/controls/MetricsControl.jsx	67.58% <0%> (-5.55%)	⬇️
... and 135 more

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[donbowman]

The other piece of this is in druid-io/pydruid#149 (for PyDruid SQL mode)

[donbowman]

are there any additional changes needed?

[donbowman]

is there anything else needed here?

[donbowman]

I don't really see how this travis failure (ERROR:root:Metric 'sum__SP_RUR_TOTL' is not valid) could relate to the additional tool-tip on these two fields.