Description of problem:
Currently there is a Candlepin API to return the servicelevels available to a given org key...

http://candlepinproject.org/apidoc/get/owners/owner_key/servicelevels/

For testing purposes, it would be helpful to accept an "exempt=true|false" parameter.


Version-Release number of selected component (if applicable):
[root@jsefler-7 ~]# subscription-manager version
server type: Red Hat Subscription Management
subscription management server: 0.9.3-1


How reproducible:


Steps to Reproduce:

Actual results:
With the TESTDATA deployed...
[root@jsefler-7 ~]# curl --stderr /dev/null --insecure --user testuser1:password --request GET https://jsefler-f14-candlepin.usersys.redhat.com:8443/candlepin/owners/admin/servicelevels | python -m simplejson/tool
[
    "Full-Service",
    "None",
    "Premium",
    "Standard",
    "Super",
]

Expected results:
[root@jsefler-7 ~]# curl --stderr /dev/null --insecure --user testuser1:password --request GET https://jsefler-f14-candlepin.usersys.redhat.com:8443/candlepin/owners/admin/servicelevels?exempt=true | python -m simplejson/tool
[
    "Exempt SLA",
]

^^^ This ficticious list should contain all of the "support_level" pool attribute values from pools available to the {owner_key} that have been defined with a "support_level_exempt" = "true" pool attribute value.