Remove invalid keyword argument 'sleep' from kafka poll

[icapurro]

Removed the invalid keyword sleep from the poll call triggered after getting an exception about invalid metadata in the offset_fetcher.

Added a unit test to validate this particular scenario.

[codecov[bot]]

Codecov Report

Merging #345 into master will not change coverage. The diff coverage is 0%.

@@           Coverage Diff           @@
##           master     #345   +/-   ##
=======================================
  Coverage   59.95%   59.95%           
=======================================
  Files          78       78           
  Lines        6143     6143           
  Branches      809      809           
=======================================
  Hits         3683     3683           
  Misses       2284     2284           
  Partials      176      176

Impacted Files	Coverage Δ
...ontera/contrib/messagebus/kafka/offsets_fetcher.py	14.89% <0%> (ø)	:arrow_up:

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[sibiryakov]

Hi @icapurro thank you for the contribution! Since this is just an incompatibility of API's then it's quite unlikely this will happen next in exactly the same place. So I propose to remove the test case, otherwise it looks fine.

[jpbalarini]

👍

[icapurro]

@sibiryakov thanks for the review. I removed the unit test; my thought was to add some unit test structure so they can be implemented more in-depth in the future.

[sibiryakov]

thank you!