Description of problem:
When giving a image to oc adm diagnostics --images=registry.corp.example.com/openshift3/ose-${component}:${version} the diagnostics pod still tries to pull an image from docker hub. This is not a desired behavior when in a disconnected environment.


How reproducible:
Every time

Steps to Reproduce:
1. oc adm diagnostics --images=registry.corp.example.com/openshift3/ose-${component}:${version} 

Actual results:
Diagnostic pod tries to pull a second image from docker hub.

Expected results:
The test pod image should at least be configurable.