Fix OpenShift deployment of todo-backend

[jmesnil]

Its openshift profile must provision the Cloud feature pack to properly deploy on OpenShift.

Remove the CORS env vars from the chart as they are already set at provisioning time with the cors_filter.cli script

[jmesnil]

@ehsavoie fiy

[openshift-ci[bot]]

@jmesnil: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/wildfly-quickstart-e2e	6f75a5e13dfd2fdc784b4bc0761381880a8fc7c6	link	true	/test wildfly-quickstart-e2e

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.