XD-1628 UI: The user can view specified/used job properties

* Add ability to view the job definition when viewing the job execution details
* Add ability to view the job module meta data (if job definition deployed) when viewing the job execution details
* Add `displayForJobname()` to `ModulesMetadataController`
* Add tests for `ModulesMetadataController`

Jira: https://jira.spring.io/browse/XD-1628