Restore test for image signature workflow

[dmage]

Closes openshift/image-registry#39.

[dmage]

/retest

[dmage]

/retest

[dmage]

/retest

[dmage]

/retest

[dmage]

/retest

[dmage]

/retest

[dmage]

/cc @bparees @mfojtik

This test is almost done except that the internal registry doesn't accept the token:

I0821 17:26:43.437071    5833 round_trippers.go:383] GET https://docker-registry.default.svc:5000/openshift/token?account=e2e-test-registry-signing-q8vj5-user&scope=repository%3Ae2e-test-registry-signing-q8vj5%2Fsigned%3Apull
I0821 17:26:43.437094    5833 round_trippers.go:390] Request Headers:
I0821 17:26:43.437108    5833 round_trippers.go:393]     Authorization: Basic ZTJlLXRlc3QtcmVnaXN0cnktc2lnbmluZy1xOHZqNS11c2VyOk9qWV9JZHp4VEtHZ0xrNFRoT0xuOVFBQUFBQUFBQUFB
I0821 17:26:43.445367    5833 round_trippers.go:408] Response Status: 401 Unauthorized in 8 milliseconds

Though, I don't know how to get logs from the registry to debug this issue.

[dmage]

I heard I shouldn't assume that the integrated registry is accessible directly from the test. And I need to start a pod to get something from the registry.

Can someone confirm this?

[dmage]

/retest

[dmage]

/retest

[dmage]

@mfojtik confirmed today that I need to interact with the registry from a pod. As we want to test the oc util, I copy it into the pod from the host system.

[bparees]

/lgtm

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