private ZToken createRoleToken(AthenzDomain domain) {
        try (ZtsClient client = createZtsClient()) {
            return client.getRoleToken(domain, ROLE_TOKEN_EXPIRY);
        }
    }
A {@link AthenzIdentityProvider} / {@link ServiceIdentityProvider} component that provides the tenant identity.

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