update CRDs url, and remove deleted test file link in README.md

[niulechuan]

CRDs URL is changed to https://github.com/kubernetes-sigs/container-object-storage-interface-api/blob/master/apis/objectstorage/v1alpha1/types.go

And, bucketrequest_test.go and objectstorage.k8s.io_test.go was removed.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: niulechuan
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[mukhoakash]

/ok-to-test
/lgtm

[mukhoakash]

/approved