Upgrades, failed to run host system upgrader separately

1. install 5.0 iso
2. run upgrade `UPGRADERS="host-system" ./upgrade.sh`

http://paste.openstack.org/show/90001/

Expected result:
upgrade succeed

Actual result:
There are errors during the puppet run

2014-08-04 09:23:44 DEBUG 20074 (utils) Error: $::fuel_settings["FUEL_ACCESS"] is :undef, not a hash or array at /var/fuel_upgrade/upgrade/puppet/modules/nailgun/examples/host-only.pp:53 on node fuel.domain.tld
2014-08-04 09:23:44 DEBUG 20074 (utils) Error: $::fuel_settings["FUEL_ACCESS"] is :undef, not a hash or array at /var/fuel_upgrade/upgrade/puppet/modules/nailgun/examples/host-only.pp:53 on node fuel.domain.tld

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "5.1"
  api: "1.0"
  build_number: "391"
  build_id: "2014-08-04_10-34-50"
  astute_sha: "ce86172e77661026c91fdf1ff8066d7df1f7d89d"
  fuellib_sha: "4e3fdd75f8dabde8e5d07067545d8043a70a176b"
  ostf_sha: "a3fa823ea0e4e03beb637ae07a91adea82c33182"
  nailgun_sha: "bd0127be0061029f9f910547db5e633c82244942"
  fuelmain_sha: "e99879292cf6e96b8991300d947df76b69134bb1"