Remove hardcoded reference to ccr in UI/DeliveryService.pm

because the value of http.routing.name in applicationContext.xml can be anything (defaults to tr), this needs to be dynamic rather than referencing the hard-coded value of 'ccr'. So my suggestion would be:

create a global parameter using a database migration file and name the parameter http.routing.name and set the default value to 'tr'. then in the code, fetch the value of http.routing.name and use that on line 147 & 150

https://github.com/apache/incubator-trafficcontrol/blob/master/traffic_ops/app/lib/UI/DeliveryService.pm#L147

https://github.com/apache/incubator-trafficcontrol/blob/master/traffic_ops/app/lib/UI/DeliveryService.pm#L150