reference to kfserving storage initializer from dockerhub

[RafalSkolasinski]

What this PR does / why we need it:

kfserving/storage-initializer images were temporarily not available for download due to gcr project issues kserve/kserve#1976

this move reference to source of images from dockerhub as suggested in the reference issue

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[agrski]

I've found some other references:

• operator/controllers/suite_test.go

  127:	"image" : "gcr.io/kfserving/storage-initializer:v0.4.0",
  

• operator/controllers/model_initializer_injector_test.go

  37:	g.Expect(d.Spec.Template.Spec.InitContainers[0].Image).To(Equal("gcr.io/kfserving/storage-initializer:v0.4.0"))
  

• operator/utils/k8s/testdata/configmap.yaml

  5:  storageInitializer: '{"cpuLimit":"1","cpuRequest":"100m","image":"gcr.io/kfserving/storage-initializer:v0.4.0","memoryLimit":"1Gi","memoryRequest":"100Mi"}'
  

• operator/config/manager/configmap.yaml

  87:        "image" : "gcr.io/kfserving/storage-initializer:v0.4.0",
  

[RafalSkolasinski]

Thanks @agrski, for some reason my search+replace didn't catch all of these

[agrski]

LGTM

[seldondev]

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