@Override
    public String toString() {
        return "OS version " + current.map(Version::toFullString).orElse("<unset>") + " [wanted: " +
               wanted.map(Version::toFullString).orElse("<unset>") + "]";
    }
Returns a copy of this with wanted version set to given version
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/node/OsVersion.java