domainid should not be accepted as input when creating a domain

email thread here:

https://lists.opendaylight.org/pipermail/aaa-dev/2017-May/001352.html

the create is allowing us to pass domainid when creating a domain, but
that id would not be used anyway as it appears to be the same as the
name.

example:

curl -u "admin:admin" -X POST -d '

{"description":"karaf4 was not easy","name":"carbon_is_late","domainid":"ThisWillNotBeUsed","enabled":"true"}

' -H "Content-Type:application/json" http://$ODL:8181/auth/v1/domains

{"domainid":"carbon_is_late","name":"carbon_is_late","description":"karaf4 was not easy","enabled":true}

curl -u "admin:admin" http://$ODL:8181/auth/v1/domains | python -m json.tool

{
"domains": [

{ "description": "default odl sdn domain", "domainid": "sdn", "enabled": true, "name": "sdn" }

,

{ "description": "karaf4 was not easy", "domainid": "carbon_is_late", "enabled": true, "name": "carbon_is_late" }

]
}