add instructions to edit registry service ip

That's now fixable - we can do it in a different issue.


> On Dec 10, 2014, at 7:55 PM, Ben Parees <notifications@github.com> wrote:
> 
> In examples/jenkins/README.md:
> 
> > @@ -22,33 +22,39 @@ Steps
> >  
> >          $ openshift kubectl apply -f jenkins-config.json
> >  
> > -4. Create the application configuration
> > +4. Determine the IP address of the docker-registry service:
> > +
> > +        $ openshift kubectl get services docker-registry -o template --template="{{ .portalIP }}"
> > +        
> > +5. Edit the application-template.json file by replacing all occurences of `172.121.17.3` with the IP address from the previous step.
> it's needed because it's the repository service IP that's part of the image name. not all the IPs were removed w/ your change.
> 
>     "output": {
>       "imageTag": "openshift/origin-ruby-sample:latest",
>       "registry": "172.121.17.3:5001"
>     },
> —
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