ORT should ignore STEERING deliveryservices

With the 2.1 version of Traffic ops ORT, ORT grabs all of the configurations for all of the Delivery services in a CDN and puts it on all caches in the CDN regardless of DS Type and DS server assignments. This causes an issue with Steering deliveryservice because A) steering DSs shouldn't be on the caches and B) steering DSs are created with certs that start with `ccr.` and ORT does not know how to find those certificates in Traffic Vault which causes ORT to fail.
ORT should be updated such that Steering delivery service configurations are not put on caches.