Prepare Management API project for Jakarta EE 8 Release

### Tasks

- [x] Update text files
- [x] Generate "boilerplate" specification project
- [x] Make a staging release
- [x] Generate Stand-alone TCK test results - Not required. Covered by Platform TCK.
- [x] Create two PRs to jakartaee/specifications repository (spec and apidocs).
Spec Draft PR: https://github.com/jakartaee/specifications/pull/75
Apidocs (Javadoc) Draft PR: https://github.com/jakartaee/specifications/pull/74
- [x] Update the Jakarta EE API jar by submitting a PR to the [jakartaee-api](https://github.com/eclipse-ee4j/jakartaee-api) project. [PR #25](https://github.com/eclipse-ee4j/jakartaee-api/pull/25)

See [here](https://wiki.eclipse.org/How_to_Prepare_API_Projects_to_Jakarta_EE_8_Release) for detailed instructions.