Change source of most of test image samples from docker-hub to local building ones, so it will cost less docker-hub pull requests.
And some of cases like push cnab, they have to use docker-hub, but image samples in cnab test will cost 17 quotas, in this PR, we
replace those samples, now cnab case will cost 6 quotas.
Signed-off-by: danfengliu <danfengl@vmware.com>
1. Add Clair should be default scanner in upgrade test;
2. Add tag retention verification in upgrade test;
3. Add tag retention verification in upgrade test;
4. Add tag Immutability verification in upgrade test;
5. Add webhook verification in upgrade test;
6. Add CVE whitelist in upgrade test;
Signed-off-by: Danfeng Liu (c) <danfengl@vmware.com>
