optimization to determine whether the pod state is consistent logic

[dafu-wu]

Ⅰ. Describe what this PR does

when we to determine whether the pod state is consistent logic and Is Image digest, call func IsPodContainerDigestEqual。
The pod container statuses may be evaluated multiple times by the func。

Ⅱ. Does this pull request fix one issue?

I'm trying to optimize it, maybe there's a better way to optimize it, maybe there's no need to optimize it.

[codecov-commenter]

Codecov Report

Merging #854 (8bbd3ff) into master (3a6e489) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #854      +/-   ##
==========================================
- Coverage   48.36%   48.30%   -0.06%     
==========================================
  Files         118      118              
  Lines       11017    11023       +6     
==========================================
- Hits         5328     5325       -3     
- Misses       4878     4895      +17     
+ Partials      811      803       -8     

Flag	Coverage Δ
unittests	48.30% <0.00%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
pkg/control/sidecarcontrol/sidecarset_control.go	36.63% <0.00%> (-1.52%)	⬇️
pkg/util/pods.go	20.19% <0.00%> (-0.40%)	⬇️
pkg/controller/daemonset/update.go	24.24% <0.00%> (-2.53%)	⬇️
pkg/controller/daemonset/daemonset_util.go	63.75% <0.00%> (-2.02%)	⬇️
pkg/controller/daemonset/daemonset_controller.go	37.25% <0.00%> (+0.87%)	⬆️
pkg/controller/cloneset/cloneset_controller.go	55.33% <0.00%> (+2.37%)	⬆️

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[FillZpp]

/lgtm
PTAL @zmberg

[FillZpp]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FillZpp

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[zmberg]

/lgtm