Fix github user content domain for openshift.sh

The domains serving user content from github have changed recently:

https://developer.github.com/changes/2014-04-25-user-content-security/

This change updates the URLs that the OpenShift templates use
to download the openshift.sh from github.

Change-Id: Ifb90b0f0225b16313821a81ce54d14f551d159ed