Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1418346

Description of problem:

API error message when using a non-existing parameter is not helpful

Version-Release number of selected component (if applicable):

Version Satellite 6.2.6

Steps to Reproduce:
1. [root@rhel7-3-server ~]# curl H "Accept:application/json,version=2" -H "Content-Type:application/json" -X POST -u admin:password -k -d '{"architecture_id":"1","environment_name":"production", "domain":"example.com","domain_id":1 }' https://sat6-2.example.com/api/hosts | python -m json.tool
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 172 0 78 100 94 618 745 -:--:-- --:--:-- --:--:-- 746 {
"error": {
"message": "Domain(#74961060) expected, got String(#3712880)"
}
}

Actual results:

{
"error": {
"message": "Domain(#74961060) expected, got String(#3712880)"
}
}

Expected results:

"Unknown parameter" error.