fix sidecarset hash without image is calculated differently when changing image tag to latest

[chengjoey]

Ⅰ. Describe what this PR does

kruise/apis/apps/defaults/v1alpha1.go

Lines 105 to 108 in 5a862a3

	func setDefaultContainer(sidecarContainer *v1alpha1.SidecarContainer) {
	container := &sidecarContainer.Container
	v1.SetDefaults_Container(container)
	for i := range container.Ports {

https://github.com/kubernetes/kubernetes/blob/60c4c2b2521fb454ce69dee737e3eb91a25e0535/pkg/apis/core/v1/defaults.go#L73-L78

when change image tag to latest, the sidecarset without image hash will be changed
I think ImagePullPolicy should not be involved in the hash, because it will cause the hash to change, causing the pod not to to be upgraded

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

apiVersion: apps.kruise.io/v1alpha1
kind: SidecarSet
metadata:
  name: sidecarset
spec:
  selector:
    matchLabels:
      app: sample
  containers:
  - name: nginx
    image: nginx:1.19.6
  updateStrategy:
    type: RollingUpdate

change 1.19.6 to latest
This is the change I printed that participates in the hash calculation
IfNotPresent -> Always

{
    "containers": [
        {
            "name": "nginx",
            "resources": {},
            "terminationMessagePath": "/dev/termination-log",
            "terminationMessagePolicy": "File",
            "imagePullPolicy": "IfNotPresent",
            "podInjectPolicy": "BeforeAppContainer",
            "upgradeStrategy": {
                "upgradeType": "ColdUpgrade"
            },
            "shareVolumePolicy": {
                "type": "disabled"
            }
        }
    ]
}

{
    "containers": [
        {
            "name": "nginx",
            "resources": {},
            "terminationMessagePath": "/dev/termination-log",
            "terminationMessagePolicy": "File",
            "imagePullPolicy": "Always",
            "podInjectPolicy": "BeforeAppContainer",
            "upgradeStrategy": {
                "upgradeType": "ColdUpgrade"
            },
            "shareVolumePolicy": {
                "type": "disabled"
            }
        }
    ]
}

Ⅳ. Special notes for reviews

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.86%. Comparing base (0d0031a) to head (98d0f9d).
Report is 64 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1697      +/-   ##
==========================================
+ Coverage   47.91%   48.86%   +0.95%     
==========================================
  Files         162      188      +26     
  Lines       23491    19291    -4200     
==========================================
- Hits        11256     9427    -1829     
+ Misses      11014     8633    -2381     
- Partials     1221     1231      +10     

Flag	Coverage Δ
unittests	48.86% <100.00%> (+0.95%)	⬆️

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[chengjoey]

@zmberg @furykerry , could you please take a look, because changing the image tag to latest will cause the pod to fail to update, I think imagePolicy should not be included in the calculation, and imagePolicy is easily affected by the mutation controller