Add unit test case for pkg/netutils/port_test.go (#2268)
Add unit test case for pkg/netutils/port_test.go (#2268)

Signed-off-by: ZouYu <fe87c7a761ef1939f89153b2599d7d74395f947c@cn.fujitsu.com>
jpkrohling/jaeger,jaegertracing/jaeger,jpkrohling/jaeger,jpkrohling/jaeger,pavolloffay/jaeger,jpkrohling/jaeger,pavolloffay/jaeger,pavolloffay/jaeger,jaegertracing/jaeger,jpkrohling/jaeger,uber/jaeger,jaegertracing/jaeger,jaegertracing/jaeger,uber/jaeger,pavolloffay/jaeger,uber/jaeger,pavolloffay/jaeger,uber/jaeger,jaegertracing/jaeger