Change image references to use quay.io instead of docker.io

[brandisher]

Since Docker has implemented an image pull limit, I find that running this template fails pretty consistently especially when running from behind a VPN or proxy.

$ oc new-app -S httpd-example
W0422 09:49:20.649467  451681 dockerimagelookup.go:240] container image remote registry lookup failed: you may not have access to the container image "docker.io/library/httpd-example:latest"

Can this repo be updated to pull the image from quay.io so user's aren't required to login to docker.io first?