Fix the logger in hotrod example to report correct caller (#2257)
Fix the logger in hotrod example to report correct caller (#2257)

Signed-off-by: scott.wang <e3ad87002c4dbdb0817882d2a51d88ef65fd01d0@gmail.com>
uber/jaeger,uber/jaeger,jpkrohling/jaeger,jpkrohling/jaeger,jpkrohling/jaeger,jpkrohling/jaeger,pavolloffay/jaeger,jaegertracing/jaeger,pavolloffay/jaeger,jaegertracing/jaeger,uber/jaeger,jaegertracing/jaeger,pavolloffay/jaeger,uber/jaeger,jaegertracing/jaeger,pavolloffay/jaeger,pavolloffay/jaeger,jpkrohling/jaeger,jaegertracing/jaeger