consider in-progress instances for UniformAcrossAZ update strategy

[shreyas-badiger]

Currently, UniformAcrossAZ update strategy doesn't consider the in-progress instances. Because of this, we might end up cordoning more number of instances than the rollup.maxUnavailable.

[codecov]

Codecov Report

Attention: Patch coverage is 82.97872% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 47.98%. Comparing base (7511a22) to head (6598147).

Files	Patch %	Lines
controllers/upgrade.go	82.97%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #438      +/-   ##
==========================================
+ Coverage   43.75%   47.98%   +4.23%     
==========================================
  Files           7        7              
  Lines        1104     1119      +15     
==========================================
+ Hits          483      537      +54     
+ Misses        575      540      -35     
+ Partials       46       42       -4     

Flag	Coverage Δ
unittests	47.98% <82.97%> (+4.23%)	⬆️

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