Description of problem:
Running bootstrap.py to register an existing RHEL6 host fails with the following error:

Error: The following error occured while talking to the API:
url: https://satellite.example.com:8443/api/v2/hosts/
code: 422
data: {
  "host": {
    "managed": "true",
    "name": "sec_test",
    "hostgroup_id": 1,
    "organization_id": 1,
    "mac": "00:50:56:95:67:67",
    "architecture_id": 1,
    "location_id": 3,
    "domain_id": 1
  }
}
error: {
  "error": {
    "errors": {
      "interfaces.name": [
        "is invalid"
      ],
      "interfaces.ip": [
        "can't be blank"
      ],
      "name": [
        "is invalid"
      ]
    },
    "id": null,
    "full_messages": [
      "Ip can't be blank",
      "Name is invalid",
      "Name is invalid"
    ]
  }
}

Version-Release number of selected component (if applicable):
katello-client-bootstrap-1.1.0-2.el7sat.noarch
satellite-6.2.1-1.2.el7sat.noarch

How reproducible:
Always

Additional info:
Also tried the script at https://github.com/Katello/katello-client-bootstrap. This one fails with the following error:

FATAL Error - local variable 'e' referenced before assignment