Increment version to v2.2.4-SNAPSHOT
[LU-219] Update MockWebServer

- Latest of MockWebServer fixes bug where content-lenght = 0 fails with delete
[LU-139] Don't parse server error for ERROR_PARSE status

- Add new originalResponse
- Only parse error if data is not null & not OK
- Make ERROR_PARSING use new CTOR to chain responses
- Fix up stream reader
Fix javadoc tasks and use delomboked source

* Delombok before generating javadocs to generate proper documentation.
* Minor javadoc fixes to avoid some warnings.
* Don't try to build variant-specific javadocs - we can't easily
  delombok merged main+(variant) source folders. Use main source
  and release resources/buildconfig to delombok and generate javadocs.
* Use delomboked source when building Maven-published javadocs.
Increment version to v2.2.4