Fix test

Author: geofffranks

migration/V4_add_rg_uniq_idx_tcp_route_migration_test.go

@@ -6,7 +6,6 @@ import (
 	"code.cloudfoundry.org/routing-api/cmd/routing-api/testrunner"
 	"code.cloudfoundry.org/routing-api/db"
 	"code.cloudfoundry.org/routing-api/migration"
-	"code.cloudfoundry.org/routing-api/migration/v0"
 	v0 "code.cloudfoundry.org/routing-api/migration/v0"
 	"code.cloudfoundry.org/routing-api/models"