Description of problem:
Due to recent changes from Bug 1455361 Bug 1461003 and Bug 1485008, the ability to register as type RHUI has changed and it is now unclear what the expected results should be when registering to a candlepin server that does not include "RHUI" from the response to candlepin's API to /consumertypes 


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


How reproducible:


Steps to Reproduce:
[root@jsefler-rhel7 ~]# curl --insecure --user REDACTED:REDACTED --stderr /dev/null --request GET https://jsefler-candlepin.usersys.redhat.com:8443/candlepin/consumertypes | python -mjson.tool
[
    {
        "id": "1000",
        "label": "system",
        "manifest": false
    },
    {
        "id": "1001",
        "label": "person",
        "manifest": false
    },
    {
        "id": "1002",
        "label": "domain",
        "manifest": false
    },
    {
        "id": "1003",
        "label": "candlepin",
        "manifest": true
    },
    {
        "id": "1004",
        "label": "hypervisor",
        "manifest": false
    },
    {
        "id": "1006",
        "label": "headpin",
        "manifest": true
    },
    {
        "id": "1007",
        "label": "katello",
        "manifest": true
    },
    {
        "id": "1008",
        "label": "share",
        "manifest": false
    }
]
[root@jsefler-rhel7 ~]# subscription-manager register --serverurl=https://jsefler-candlepin.usersys.redhat.com:8443/candlepin --user=testuser1 --org=admin --type=RHUI
Registering to: jsefler-candlepin.usersys.redhat.com:8443/candlepin
Password: 
The system has been registered with ID: c7bfd6eb-28b4-4400-849c-c78d42856e8a
The registered system name is: jsefler-rhel7.usersys.redhat.com
[root@jsefler-rhel7 ~]# subscription-manager version
server type: Red Hat Subscription Management
subscription management server: 2.1.1-1
subscription management rules: 5.25
subscription-manager: 1.20.1-1.git.64.ce23c12.el7
python-rhsm: 1.20.1-1.git.42.ce23c12.el7
[root@jsefler-rhel7 ~]# 


Actual results:
  Notice above that we can successfully register as type=RHUI despite the response from candlepin's /consumertypes does not include RHUI.


Expected results "Unit type 'RHUI' could not be found."

-----------------------------------------

For comparison, here are the results from the current staged candlepin where RHUI is among the consumer types...

[root@jsefler-rhel7 ~]# subscription-manager unregister
Unregistering from: jsefler-candlepin.usersys.redhat.com:8443/candlepin
System has been unregistered.
[root@jsefler-rhel7 ~]# curl --insecure --user REDACTED:REDACTED  -stderr /dev/null --request GET http://candlepin.dist.stage.ext.phx2.redhat.com/candlepin/consumertypes | python -mjson.tool
[
    {
        "id": "0",
        "label": "system",
        "manifest": false
    },
    {
        "id": "1",
        "label": "person",
        "manifest": false
    },
    {
        "id": "2",
        "label": "candlepin",
        "manifest": false
    },
    {
        "id": "3",
        "label": "domain",
        "manifest": false
    },
    {
        "id": "4",
        "label": "RHUI",
        "manifest": false
    },
    {
        "id": "5",
        "label": "sam",
        "manifest": true
    },
    {
        "id": "6",
        "label": "hypervisor",
        "manifest": false
    },
    {
        "id": "9",
        "label": "satellite",
        "manifest": true
    }
]
[root@jsefler-rhel7 ~]# subscription-manager register --serverurl=http://subscription.rhsm.stage.redhat.com:443/subscription/ --user=qa  --type=RHUI
Registering to: subscription.rhsm.stage.redhat.com:443/subscription/
Password: 
The system has been registered with ID: 991f1483-6883-4e9e-bbd5-01a9e7283463
The registered system name is: jsefler-rhel7.usersys.redhat.com
[root@jsefler-rhel7 ~]# subscription-manager version
server type: Red Hat Subscription Management
subscription management server: 2.0.40-1
subscription management rules: 5.24.1
subscription-manager: 1.20.1-1.git.64.ce23c12.el7
python-rhsm: 1.20.1-1.git.42.ce23c12.el7


Actual and expected results:
  Notice above that we can successfully register as type=RHUI and that the response from candlepin's /consumertypes does indeed include RHUI.