Fixes to allow --redis-url to pass through all tests

[chayim]

Pull Request check-list

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Description of change

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[codecov-commenter]

Codecov Report

Merging #1700 (18d0fd8) into master (ec172e7) will decrease coverage by 3.09%.
The diff coverage is 82.19%.

@@            Coverage Diff             @@
##           master    #1700      +/-   ##
==========================================
- Coverage   92.21%   89.12%   -3.10%     
==========================================
  Files          53       53              
  Lines       11009    11067      +58     
==========================================
- Hits        10152     9863     -289     
- Misses        857     1204     +347     

Impacted Files	Coverage Δ
tests/test_monitor.py	74.50% <44.44%> (-25.50%)	⬇️
tests/test_commands.py	93.54% <82.35%> (-6.27%)	⬇️
tests/conftest.py	94.19% <84.61%> (+0.53%)	⬆️
tests/test_connection_pool.py	94.35% <100.00%> (-5.65%)	⬇️
tests/test_pubsub.py	97.62% <100.00%> (-2.12%)	⬇️
tests/test_scripting.py	100.00% <100.00%> (ø)
redis/commands/core.py	83.85% <0.00%> (-6.21%)	⬇️
... and 4 more

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