Ability to disable stats printing to log

Restore original logging levels

Also JavaDoc added.

Remove migration code

Increase jobDetailsAfterWriteExpirationInMinutes to 12h

Invalidation button can be used in case of changes.

[maven-scm] copy for tag rundeck-3.4

[maven-scm] copy for tag rundeck-3.3

[maven-scm] copy for tag rundeck-3.2

[maven-scm] copy for tag rundeck-3.1

[maven-scm] copy for tag rundeck-3.0

[maven-scm] copy for tag rundeck-2.11