Future groups for undertow-ee packages

[Yun Zhou]

For 2.4.0.Final, it looks like websockets-jsr and undertow-servlet have been extracted to a separate undertow-ee repo and are now published to the 'undertow-ee' maven group name. 

However, the source code for these packages have not been removed from the main branch in the undertow repo, and that new PRs to the servlet package (e.g. https://github.com/undertow-io/undertow-ee/pull/99 ) are being merged into both the undertow repo and the undertow-ee repo. 

Is the purpose of this duplication for the sake of backporting to earlier versions of undertow, or will there be both undertow and undertow-ee editions of servlet and websockets-jsr?

Thanks in advance!