+++ This bug was initially created as a clone of Bug #1781290 +++

We run skew tests from 4.2 to 4.3 (where we install 4.2, upgrade to 4.3, but stop before updating nodes).  We then run the 4.2 e2e tests (which verifies that you didn't regress the API function).

Sometime in the last few weeks, the build subsystem e2e tests started failing continuously :

https://prow.svc.ci.openshift.org/view/gcs/origin-ci-test/logs/release-openshift-origin-installer-old-rhcos-e2e-aws-4.3/160

[Feature:Builds][pruning] prune builds based on settings in the buildconfig [Conformance] buildconfigs should have a default history limit set when created via the group api [Suite:openshift/conformance/parallel/minimal] 

fail [github.com/openshift/origin/test/extended/builds/build_pruning.go:43]: Unexpected error:
    <*errors.errorString | 0xc0000a7a00>: {
        s: "Timed out waiting for internal registry hostname to be published",
    }
    Timed out waiting for internal registry hostname to be published
occurred

There are three cases, this bug must be fixed in the appropriate place:

1. We don't correctly run these e2e tests when the control plane is 4.3 - fix in the 4.2 tests to tolerate a 4.3 control plane so that we can see it pass
2. We regressed a product API that a 4.2 client fails against a 4.3 server - must fix for ship because we don't regress APIs
3. We don't correctly work with the registry when the control plane is 4.3 and the nodes are 4.2 - must fix because you would break if someone ran during an upgrade.

This bug may not be deferred.

--- Additional comment from Clayton Coleman on 2019-12-09 17:27:57 UTC ---

Dec  9 12:47:39.809: INFO: Waiting up to 2 minutes for the internal registry hostname to be published
Dec  9 12:47:42.186: INFO: did not find the sequence in the OCM pod logs around the build controller getting started after the internal registry hostname has been set in the OCM config

--- Additional comment from Adam Kaplan on 2019-12-09 18:01:50 UTC ---

> There are three cases, this bug must be fixed in the appropriate place:
> 
> 1. We don't correctly run these e2e tests when the control plane is 4.3 - fix in the 4.2 tests to tolerate a 4.3 control plane so that we can see it pass
> 2. We regressed a product API that a 4.2 client fails against a 4.3 server - must fix for ship because we don't regress APIs
> 3. We don't correctly work with the registry when the control plane is 4.3 and the nodes are 4.2 - must fix because you would break if someone ran during an upgrade.

I suspect #1 - we found on 4.3 we started flaking because the test depended on a specific controller start sequence. We are in fact getting the right internal registry hostname synced:

```
2019-12-09T12:34:29.970319148Z I1209 12:34:29.970252       1 build_controller.go:474] Starting build controller
2019-12-09T12:34:29.970319148Z I1209 12:34:29.970305       1 build_controller.go:476] OpenShift image registry hostname: image-registry.openshift-image-registry.svc:5000
2019-12-09T12:34:30.033985328Z I1209 12:34:30.033931       1 deleted_token_secrets.go:72] caches synced
2019-12-09T12:34:30.034172215Z I1209 12:34:30.034145       1 docker_registry_service.go:154] caches synced
2019-12-09T12:34:30.034209042Z I1209 12:34:30.034188       1 create_dockercfg_secrets.go:220] urls found
2019-12-09T12:34:30.034209042Z I1209 12:34:30.034202       1 create_dockercfg_secrets.go:226] caches synced
2019-12-09T12:34:30.034705813Z I1209 12:34:30.034664       1 docker_registry_service.go:284] Updating registry URLs from map[172.30.107.118:5000:{} image-registry.openshift-image-registry.svc.cluster.local:5000:{} image-registry.openshift-image-registry.svc:5000:{}] to map[172.30.107.118:5000:{} image-registry.openshift-image-registry.svc.cluster.local:5000:{} image-registry.openshift-image-registry.svc:5000:{}]
```