api/1.2/deliveryservices/:id/routing.json hangs when Traffic Router is unreachable

I was testing this API "/api/1.2/deliveryservices/:id/routing.json" and found that it would hang and the perl worker had to be killled. This caused 500 Errors back from TO API.

The root cause is Traffic Router not responding to API Port.

We should not poll Traffic Router that are status=OFFLINE and there should be some sort of timeouts in place to make sure it doesn't take more than x seconds to return information from API

There is some comments in the code that seems to indication prior issues.

`# TODO: what happens when the request to CCR times out?`