Add a `deploy.route.host` field to specify the host of the Route exposing the application

[jmesnil]

Is your feature request related to a problem? Please describe.

The route created to expose the application does not provide a host field and let OpenShift sets it. However, it should be possible to specify a host so that the user can control how their application is exposed outside of the cluster.

Describe the solution you'd like

Add a deploy.route.host field whose string value will be used to set the spec.host field of the Route resource created by the chart.