ISPN-3728 Bring back Infinispan Server, and LevelDB+REST cache stores

* Bring back LevelDB store to main source repository.
* Bring back REST store to main source repository.
* Bring back Infinispan Server to server/integration folder
* Leave maven artifact IDs as they are.
* Excluse some packages from javadoc generation so that the javadoc generation stops halting with errors.
* Adjust main release script so that it also copies over the server distribution zip files. Both library and embedded distribution zip files should be rsynched.
* Adjust release script to avoid  changing version for jboss-parent pom reference.
* Adjuts release script so that server integration artifacts get uploaded as well.
* Add REST, LevelDB and CLI cache stores to all distribution ZIP file