TeslaCN opened a new issue #1755:
URL: https://github.com/apache/shardingsphere-elasticjob/issues/1755
## Enhancement
Set port 0 as listen port means let system determine which port to use. It
should log the actual port rather than 0.
```java
SnapshotService snapshotService = new SnapshotService(REG_CENTER, 0);
snapshotService.listen();
```
```
21:08:08.370 [main] INFO
org.apache.shardingsphere.elasticjob.lite.internal.snapshot.SnapshotService -
ElasticJob: Snapshot service is running on port '0'
```
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