1. Add update of imagestream with --dry-run=server test.
2. Fixed the error in disconection cluster we see from sippy, use an existing internal image stream tag openshift/cli:latest instead.
fail [github.com/openshift/origin/test/extended/images/dryrun.go:26]: Unexpected error:
    <*errors.errorString | 0xc00773a040>: 
    timed out while waiting of an image stream tag e2e-test-image-dry-run-d8lks/test:latest
    {
        s: "timed out while waiting of an image stream tag e2e-test-image-dry-run-d8lks/test:latest",
    }
occurred

    

  4.21
    

    1.
    2.
    3.