Description of problem:
Currently, querying the syspurpose status of a consumer, either by using the /consumers/{consumer_uuid}/purpose_compliance API, or by fetching the consumer with the /consumers/{consumer_uuid} API and then reading the systemPurposeStatus field on that, will show the status to be one of valid/partial/invalid. This does not fit with the original design, which is to return one of these states as a status: matched/mismatched/not specified.

Version-Release number of selected component (if applicable):
All current versions that support syspurpose, up to 2.5.8, 2.3.11 and master.

How reproducible:
100%

Steps to Reproduce:
1. Perform a GET request on the /consumers/{consumer_uuid}/purpose_compliance API and check the value of the 'status' field.

Actual results:
The status field has the value of either valid, invalid, or partial.

Expected results:
The status field should have the value of either matched, mismatched, or not specified.

Additional info:
An additional minor issue is that the response's 'reasons' include two reasons for each non-compliant SLA or usage, while there should be one for each.