Update default registry url for cdk 3

Yesterday I started cdk 3 and it seemed to start ok, but was not really ok.
The registry command didn't really work:

$ ./minishift openshift registry
No information found for 'service/docker-registry'

The result is that the openshift connection details showed this under Image Registry URL:
https://hub.openshift.rhel-cdk.10.1.2.2.xip.io

This seems like the default value for cdk 2. I think we should update the default value for cdk 3. Or is this simply a default value for an openshift connection? In any case, this should use the cdk 3 value.