Possibility to define default sub-domain for kafka cluster routes

Issue

• The default sub domain is set up with a certificate signed by a trusted CA. Customer manage these in a loadbalancer in front of Openshift, to limit the number of machines/clusters that need to be changed when customer get a new certificate. In Openshift we use the selfsigned certificate so the setup in the loadbalancer is tls reencrypt to this domain.This makes the tls handshake to the kafka cluster fail.
• Customer would like to have the possibility to setup a seperate subdomain for kafka clusters in openshift so that he can set the loadbalancer for routes on this subdomain to use passthrough and not reencrypt
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