Add a s2i based deployment of 'spring-petclinic'

[jwmatthews]

Below may be worth considering for adding another s2i based example app

See: https://github.com/spring-projects/spring-petclinic

[jwmatthews]

Below links may help for getting a demo running on openshift with mysql

• https://github.com/burrsutter/spring-petclinic
• https://github.com/demo-thursday/azure-service-operator/tree/master/base