ISPN-2683 AS7.x modules packaging

https://issues.jboss.org/browse/ISPN-2683

This currently contains: core, cachestore-jdbc, cachestore-remote, hotrod-client, tree and jgroups.
The modules are packaged in a 5.2 slot as not to overwrite the AS's own instance of Infinispan (which obviously is used internally for clustering + caching)