Unable set hostname in fuelmenu

Summary:

Manual installation fuel-master node. Unable set hostname in fuelmenu on first node boot.

Fuel 8.0 build 529 (RC1)

[root@fuel log]# cat /etc/fuel/version.yaml
VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "8.0"
  api: "1.0"
  build_number: "529"
  build_id: "529"
  fuel-nailgun_sha: "baec8643ca624e52b37873f2dbd511c135d236d9"
  python-fuelclient_sha: "4f234669cfe88a9406f4e438b1e1f74f1ef484a5"
  fuel-agent_sha: "658be72c4b42d3e1436b86ac4567ab914bfb451b"
  fuel-nailgun-agent_sha: "b2bb466fd5bd92da614cdbd819d6999c510ebfb1"
  astute_sha: "b81577a5b7857c4be8748492bae1dec2fa89b446"
  fuel-library_sha: "e2d79330d5d708796330fac67722c21f85569b87"
  fuel-ostf_sha: "3bc76a63a9e7d195ff34eadc29552f4235fa6c52"
  fuel-mirror_sha: "fb45b80d7bee5899d931f926e5c9512e2b442749"
  fuelmenu_sha: "e071216cb214e34b4d861478033425ee6a54a3be"
  shotgun_sha: "63645dea384a37dde5c01d4f8905566978e5d906"
  network-checker_sha: "a43cf96cd9532f10794dce736350bf5bed350e9d"
  fuel-upgrade_sha: "616a7490ec7199f69759e97e42f9b97dfc87e85b"
  fuelmain_sha: "a365f05b903368225da3fea9aa42afc1d50dc9b4"

Steps to reproduce:
1. Start Fuel installation from ISO image
2. After CentOS installation complete and the node reboot first time wait until fuelmenu apply default setting and press any key for run fuelmenu
3. Choice "DNS & Hostname"
4. Change:
   - Hostname: kh-env-1-fuel-80-259
   - Domain: kh.local
   - Search Domain: kh.local
5. Don't change any other option. All other settings filled by default values.
6. Choice "Quit Seup" -> "Save and Quit"

Expected result:
   After installation complete, hostname has entered name - "kh-env-1-fuel-80-259".
   Entered name of host saved in /etc/hostname file.

Actual result:
   Hostname is "fuel.domain.tld"
   In "/etc/hostname" file: fuel.domain.tld
   In "/etc/hosts" file: 10.20.0.2 kh-env-1-fuel-80-259.kh.local kh-env-1-fuel-80-259