ELBv2: Describe/Modify Listener Attributes

[bblommers]

Fixes #8270

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.56%. Comparing base (2381df4) to head (8ff0b08).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8280      +/-   ##
==========================================
+ Coverage   94.53%   94.56%   +0.02%     
==========================================
  Files        1158     1158              
  Lines      100579   100606      +27     
==========================================
+ Hits        95085    95134      +49     
+ Misses       5494     5472      -22     

Flag	Coverage Δ
servertests	28.87% <28.57%> (-0.01%)	⬇️
unittests	94.53% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.