Add routed-service-insertion

Extend L3 router to add "service_type_id" attribute, and extend LB vip, pool,
and health_monitor to add "router_id" attribute.

Implements: API and DB model for blueprint routed-service-insertion
Change-Id: I12f053e0b0e6cf0813ea88dd568aae49b09b8215
Merge "Add routed-service-insertion"