bump route-emitter
bump route-emitter

Submodule src/code.cloudfoundry.org/route-emitter 6c6f84ac..cafc9383:
  > Revert "Adds router_group_guid in the messages emitted by nats handler"

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release