Server adapter wizard: reconfiguring oc will cause warning, where it should error

1. ASSERT: have a project with a service running on OpenShift
2. ASSERT: have the PR applied to your code
3. ASSERT: in OpenShift Preferences: have oc not configured (or alternatively have it pointed to a location with a " " - ex. ~/oc binaries/oc) -> in both cases preferences will display a warning
4. EXEC: launch server adapter wizard for your service
5. ASSERT: server adapter wizard shows an error with a link to "configure" the oc binary
   
6. EXEC: hit "configure" and then in preferences configure a fake oc file (ex. a dummy file that you created with "touch ~/oc && chmod +x oc").
7. ASSERT: after closing preferences you're back in the server adapter wizard

Result:
Server adapter wizard now shows a warning, while it should show an error