@Override
    public Optional<SignedIdentityDocument> getTenantIdentityDocument(String host, int documentVersion) {
        return getIdentityDocument(host, "tenant", documentVersion);
    }
Default implementation of {@link IdentityDocumentClient}

@author bjorncs
vespa-athenz/src/main/java/com/yahoo/vespa/athenz/identityprovider/client/DefaultIdentityDocumentClient.java