reboot_gentoo not working

reboot_gentoo.json

{
  "provisioners": [
    {
      "type": "shell",
      "inline": [
        "echo '1st script'",
        "reboot",
        "ifconfig enp0s3 down"
        ]
    },
    {
      "type": "shell",
      "inline": [
        "echo '2nd script'",
        "",
        ""
        ]
    }
  ],
  "builders": [
    {
      "type": "virtualbox",
      "name": "virtualbox-gentoo",
      "boot_command": [
        "gentoo-nofb<enter><wait10><wait10><wait10><enter><wait10><wait10>",
        "passwd<enter><wait>",
        "vagrant<enter><wait>",
        "vagrant<enter><wait>",
        "/etc/init.d/sshd start<enter><wait>"
      ],
      "guest_os_type": "Gentoo",
      "iso_url": "http://distfiles.gentoo.org/releases/x86/autobuilds/20130820/install-x86-minimal-20130820.iso",
      "iso_checksum": "1dae36fdead310a3a1c37c71b26487f0cf14ef7f029229c7d4af1df8cec8b7236ade7dd7cf1e1a32daecd1f7bb126902c98242f0885c0895cb6f9658fdcfc5ad",
      "iso_checksum_type": "sha512",
      "ssh_username": "root",
      "ssh_password": "vagrant",
      "virtualbox_version_file": ".vbox_version"
    }
  ]
}