Fix broken tests

[hongkailiu]

https://issues.redhat.com/browse/OTA-1552

From the CI test:

failures:
    net::docker_io::test_dockerio_anonymous_auth
    net::quay_io::test_quayio_auth_layer_blob
    net::quay_io::test_quayio_auth_login
    net::quay_io::test_quayio_auth_manifest
    net::quay_io::test_quayio_auth_manifestref
    net::quay_io::test_quayio_auth_manifestref_missing
    net::quay_io::test_quayio_auth_tags

test result: FAILED. 16 passed; 7 failed; 1 ignored; 0 measured; 0 filtered out; finished in 1.39s

there are 7 tests failing in our CI job. net::docker_io::test_dockerio_anonymous_auth is fixed by #269 and the remained six are fixed by this PR.

---

The trick of getting an image for application/vnd.docker.distribution.manifest.v1+prettyjws which is required by net::quay_io::test_quayio_auth_manifest:

dkregistry-rs/tests/net/quay_io/mod.rs

Line 221 in 8e021d0

assert_eq!(has_manifest, Some(MediaTypes::ManifestV2S1Signed));

I tried with GPG sign with podman podman push --sign-by hongkliu@redhat.com quay.io/openshift-ota/cincinnati-test:0.0.1 --authfile /tmp/hk.json but it did not work.

So I noticed this PUBLIC image:

dkregistry-rs/tests/net/quay_io/mod.rs

Lines 202 to 207 in 8e021d0

	let image = "coreos/alpine-sh";
	let reference = "latest";
	let fut = dclient.has_manifest(image, reference, None);
	let has_manifest = runtime.block_on(fut).unwrap();
	assert_eq!(has_manifest, Some(MediaTypes::ManifestV2S1Signed));

and check with

$ curl -I -sH 'Accept: application/vnd.docker.distribution.manifest.v1+prettyjws' https://quay.io/v2/coreos/alpine-sh/manifests/latest | grep content-type
content-type: application/vnd.docker.distribution.manifest.v1+prettyjws

Great. It has the expected type. Then I copied the image over and net::quay_io::test_quayio_auth_manifest becomes green.

$ skopeo copy --dest-authfile /tmp/hk.json docker://quay.io/coreos/alpine-sh:latest docker://quay.io/openshift-ota/cincinnati-test:0.0.1

Other changes in the PR are the adjustments for the new image.

Hindsight is that it is very unlikely we have this type of images for OpenShift releases: neither cosign nor gpg signs images with that type. But maybe other projects relies on this. So keeping the type of image in the test intact might be a good idea.

[hongkailiu]

Replacing #271 which was closed unexpectedly.