fabric8:apply should behave as "oc expose" if no fabric8.domain property nor $KUBERNETES_DOMAIN specified

fabric8:apply does not create routes if fabric8.domain property nor $KUBERNETES_DOMAIN specified.

Note that "oc expose" does not need the domain specified, it uses the default configured in master.

fabric8:apply should use the same default as the "oc expose" would use on OpenShift.

see
https://docs.openshift.com/enterprise/3.0/install_config/install/deploy_router.html#customizing-the-default-routing-subdomain