@Override
    public List<HostSpec> prepare(ClusterSpec cluster, Capacity capacity, ProvisionLogger logger) {
        provisioned.add(cluster, capacity);
        return provisioner.prepare(applicationId, cluster, capacity, logger);
    }
A wrapper for {@link Provisioner} to avoid having to expose multitenant
behavior to the config model. Adapts interface from a {@link HostProvisioner} to a
{@link Provisioner}.

@author Ulf Lilleengen
configserver/src/main/java/com/yahoo/vespa/config/server/provision/ProvisionerAdapter.java