use configmaps for configfile locations

[mathianasj]

It would be nice to be able to use configmaps as locations for configFiles instead of just secrets. One use case this is helpful is when using a corporate proxy the performs the tls termination when clair connects to github.com I would rather set a configmap with the config.openshift.io/inject-trusted-cabundle=true label so I don't have to manage the ca-trust bundle in multiple locations.