Adjust HA-proxy config for slapd service.

HA-proxy config for slapd service should be updated:
https://github.com/openstack/fuel-plugin-ldap/blob/master/deployment_scripts/puppet/modules/plugin_ldap/manifests/ldap_proxy_init.pp

  openstack::ha::haproxy_service { 'slapd':
    internal_virtual_ip => $internal_virtual_ip,
    ipaddresses => $controller_ip,
    server_names => $controller_nodes,
    order => '180',
    listen_port => '389',
    define_backups => true,
    haproxy_config_options => {
      option => ['tcplog','clitcpka','srvtcpka', 'ldap-check'],
      balance => 'leastconn',
      mode => 'tcp',
      'timeout server' => '28801s',
      'timeout client' => '28801s',
    },
    balancermember_options => 'check inter 20s fastinter 2s downinter 2s rise 3 fall 3',
    } ~> Service<| title == 'haproxy' |>