SUBMARINE-513. Remove "\n" in job logs

[JohnTing]

What is this PR for?

When logging job output, the content contains "\n", didn't print correctly.

curl -X GET http://127.0.0.1:8080/api/v1/jobs/logs/job_1590165277436_0001

What type of PR is it?

Improvement

Todos

• [X ] - Task

What is the Jira issue?

https://issues.apache.org/jira/projects/SUBMARINE/issues/SUBMARINE-513

How should this be tested?

• First time? Setup Travis CI as described on https://submarine.apache.org/contribution/contributions.html#continuous-integration
• Strongly recommended: add automated unit tests for any new or changed behavior
• Outline any manual steps to test the PR here.

Screenshots (if appropriate)

Questions:

• Does the licenses files need update? Yes/No
• Is there breaking changes for older versions? Yes/No
• Does this needs documentation? Yes/No

[xunliu]

@JohnTing Thank you fixed this problem.

What type of PR is it?
[Bug Fix | Improvement | Feature | Documentation | Hot Fix | Refactoring]

Please select a type.

[tangzhankun]

@JohnTing Thanks for the contribution. It looks good to me. The only concern is when the log data size is huge in some extreme cases, we may crash the submarine server. But I'm ok with the current implementation before we have a better log solution. Will get this in soon.