Specifying both zipkin and jaeger configuration results in obscure error

[Stono]

Hey,
With the following configuration:

 13   jaeger-collector-host: jaeger-agent.istio-system.svc.cluster.local
 14   jaeger-service-name: nginx
 15   zipkin-collector-host: zipkin.istio-system.svc.cluster.local
 16   zipkin-service-name: nginx

You get the following error:

-------------------------------------------------------------------------------
W0125 19:01:27.503342       7 queue.go:113] requeuing , err
-------------------------------------------------------------------------------
Error: exit status 1
2018/01/25 19:01:27 [error] 8169#8169: `jaeger_service_name` must be specified
nginx: [error] `jaeger_service_name` must be specified
nginx: configuration file /tmp/nginx-cfg803870234 test failed

Which is resolved if you remove the zipkin section (so the error is missleading)