web and api url transposed.

Added unit test to catch this in the future, as well as very the
other items on consumer.json

TEST
--------
* register a candlepin consumer, then get ```href``` from following command
```./cpc register mymachine candlepin ""   '{"key" => "fact"}' admin admin```

* then export said consumer
```curl -k -u admin:admin https://localhost:8443/candlepin/consumers/UUID/export > export.zip```

* verify the consumer.json contains the correct values for urlApi and urlWeb.
  * mkdir verify
  * cd verify
  * unzip ../export.zip
  * unzip consumer_export.zip
  * vi export/consumer.json