Add liveness/readiness probes to Dex deployment
Add liveness/readiness probes to Dex deployment

This will ensure Kubernetes waits for the pods to become ready before
starting to send them traffic, which should in turn prevent the orchestration
proceeding and bootstrap completing until we have at least one working Dex pod

Fixes bsc#1062542

ereslibre/salt,ereslibre/salt,ereslibre/salt,kubic-project/salt,kubic-project/salt,kubic-project/salt