@Override
        public ClusterSpec getClusterSpecWithVersion(Version version) {
            // Not exclusive
            return ClusterSpec.request(getClusterSpecType(), getClusterSpecId()).exclusive(false).vespaVersion(version).build();
        }
Returns the hosts from the input list which are not retired
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/ProvisioningTester.java