ck testfixes

[chayim]

• Fixing multiprocessing tests to respect redisurl ports
• test improvement: do not fill modules information if no modules present
• Marking module loader as redismod

[codecov-commenter]

Codecov Report

Merging #1696 (139415b) into master (776dd59) will decrease coverage by 0.01%.
The diff coverage is 86.20%.

@@            Coverage Diff             @@
##           master    #1696      +/-   ##
==========================================
- Coverage   92.24%   92.22%   -0.02%     
==========================================
  Files          53       53              
  Lines       10994    11002       +8     
==========================================
+ Hits        10141    10147       +6     
- Misses        853      855       +2     

Impacted Files	Coverage Δ
tests/conftest.py	95.07% <63.63%> (-1.28%)	⬇️
tests/test_connection.py	80.55% <100.00%> (+1.14%)	⬆️
tests/test_connection_pool.py	100.00% <100.00%> (ø)
tests/test_monitor.py	100.00% <100.00%> (ø)
tests/test_multiprocessing.py	100.00% <100.00%> (ø)
tests/test_pubsub.py	99.73% <100.00%> (ø)
tests/test_sentinel.py	99.23% <100.00%> (ø)

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