storage: skip TestIntegration_BucketPolicyOnly
storage: skip TestIntegration_BucketPolicyOnly

updates #1480

Change-Id: I02ba6b8d626515f09b0935bd20ad3d296bb0fbc5
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/47976
Reviewed-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Jean de Klerk <605b93664484fed1e671a07bff68da39e73d0174@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go