[controller] Ignore replicas when checking for an update

[jeromefroe]

This commit updates the updatedStatefulSet method of the controller to ignore replicas when determining if it should update a StatefulSet. Changing the number of replicas in a cluster requires changes to the cluster's placement, which the controller already supports, so we can bypass checking the replicas in updatedStatefulSet to allow such changes to be processed by the controller later in the control loop.

[codecov]

Codecov Report

Merging #238 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #238   +/-   ##
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  Coverage   76.45%   76.45%           
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  Files          30       30           
  Lines        2170     2170           
=======================================
  Hits         1659     1659           
  Misses        379      379           
  Partials      132      132           

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