Description of problem:
Observed that after set "auto-attach" to disabled on the client, the auto-attach is working on the client 

Version-Release number of selected component (if applicable):
subscription management server: 2.0.20-1
subscription management rules: 5.20
subscription-manager: 1.18.4-1.git.10.dfae74e.el6
python-rhsm: 1.18.4-1.git.9.bd3c973.el6


How reproducible:
always

Steps to Reproduce:
1.Register client and set auto-attach to "disabled"
2.Execute sbuscription-manager attach --auto
3.

Actual results:
auto-attach works on the client

Expected results:
auto-attach should fail saying its disabled on the machine

Additional info:
[root@test ~]# curl -X GET -k -u username:password "https://server.redhat.com:8443/candlepin/owners/admin/" | python -mjson.tool  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
124   373    0   373    0     0    247      0 --:--:--  0:00:01 --:--:--  1130
{
    "autobindDisabled": false, 
    "contentPrefix": null, 
    "created": "2016-11-18T13:01:00+0000", 
    "defaultServiceLevel": null, 
    "displayName": "Admin Owner", 
    "href": "/owners/admin", 
    "id": "8ac6a36358778686015877869b090004", 
    "key": "admin", 
    "logLevel": null, 
    "parentOwner": null, 
    "updated": "2016-11-21T10:11:03+0000", 
    "upstreamConsumer": null
}
[root@test ~]# subscription-manager identity
system identity: ef8fd3e5-e320-4d01-8ad1-5ad520ea43c7
name: test
org name: Admin Owner
org ID: admin

[root@test ~]# subscription-manager auto-attach --show
Auto-attach preference: disabled