Add ability to set openshift container images
Add ability to set openshift container images

This allows to use a local registry when deploying openshift.

Depends-On: I66c0816eee5bafe02b7a2c8eb7fed71ea8138075
Depends-On: Icad8918a7359a863b746b0bf9c2f2597a5c71bf8
Change-Id: I2076955189fcf53103a1502537a13333b628f408

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates