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Token requester

Token requester is an Kafka PrincipalType+name string, who requested this token.  Owner and Token requester can be same.

public class CreateDelegationTokenOptions extends AbstractOptions<CreateDelegationTokenOptions> {
    private long maxLifeTimeMs = -1;
    private List<KafkaPrincipal> renewers =  new LinkedList<>();
    private Optional<KafkaPrincipal> owner = Optional.empty();

    public CreateDelegationTokenOptions owner(KafkaPrincipal owner) {
        this.owner = Optional.of(owner);
        return this;
    }

    public CreateDelegationTokenOptions renewers(List<KafkaPrincipal> renewers) {
        this.renewers = renewers;
        return this;
    }

    public Optional<KafkaPrincipal> owner() {
        return owner;
    }

    public List<KafkaPrincipal> renewers() {
        return renewers;
    }

    public CreateDelegationTokenOptions maxlifeTimeMs(long maxLifeTimeMs) {
        this.maxLifeTimeMs = maxLifeTimeMs;
        return this;
    }

    public long maxlifeTimeMs() {
        return maxLifeTimeMs;
    }
}