private void createSystemTenants(ConfigserverConfig configserverConfig) {
        List<TenantName> systemTenants = new ArrayList<>();
        systemTenants.add(DEFAULT_TENANT);
        if (configserverConfig.hostedVespa()) systemTenants.add(HOSTED_VESPA_TENANT);

        for (final TenantName tenantName : systemTenants) {
            try {
                writeTenantPath(tenantName);
            } catch (RuntimeException e) {
                // Do nothing if we get NodeExistsException
                if (e.getCause().getClass() != KeeperException.NodeExistsException.class) {
                    throw e;
                }
            }
        }
    }
Creates the tenants that should always be present into ZooKeeper. Will not fail if the node
already exists, as this is OK and might happen when several config servers start at the
same time and try to call this method.
configserver/src/main/java/com/yahoo/vespa/config/server/tenant/TenantRepository.java