Forward port changes from #2729 to master

[deniszh]

Forward port changes from #2729 to master

• fixing Redis tests
• upgrading umsgpack to 2.7.1
• adding python 3.10, deprecating python 3.6 in tests
• removing test_is_local_interface_dns (flacky af)

Deepsource Errors coming mostly from umsgpack and old tests.

[codecov-commenter]

Codecov Report

Merging #2730 (eb831cb) into master (5f35fc2) will decrease coverage by 0.85%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2730      +/-   ##
==========================================
- Coverage   77.09%   76.23%   -0.86%     
==========================================
  Files         176       88      -88     
  Lines       18972     9593    -9379     
  Branches     4034     2149    -1885     
==========================================
- Hits        14626     7313    -7313     
+ Misses       3814     2014    -1800     
+ Partials      532      266     -266     

Impacted Files	Coverage Δ
webapp/graphite/umsgpack.py	0.00% <0.00%> (ø)
graphite/events/admin.py
graphite/functions/views.py
graphite/intervals.py
graphite/url_shortener/baseconv.py
graphite/tags/localdatabase.py
graphite/events/migrations/0001_initial.py
graphite/dashboard/send_graph.py
graphite/umsgpack.py
graphite/finders/ceres.py
... and 79 more

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[lgtm-com[bot]]

This pull request introduces 1 alert when merging eb831cbb909d6973d1cf53453615b206f3aa8415 into 523c57609f7354617696efafe84d1833b1620c6b - view on LGTM.com

new alerts:

• 1 for Module is imported with 'import' and 'import from'