[WFLY-2469] Upgrade to HornetQ 2.4.0.Beta3

HornetQ depends on Netty 4 which has changed its package from
org.jboss.netty to io.netty.

* dependency changes:
  * upgrade HornetQ to 2.4.0.Beta3
  * add dependency to Netty 4.0.12 (GAV io.netty:netty-all:4.0.12)

* module changes:
  * add io.netty module for Netty 4.x (and keep org.jboss.netty module for
    Netty 3.x)
  * add hornetq-native jar to org.hornetq module (this jar contains now
    both Java classes and native libraries)
* management model changes:
  * remove servlet-connector resource that was using Netty 3.x HTTP
    tunneling Servlet and was added a workaround until HornetQ support
    one-port to be accessible over HTTP
[WFLY-2346] add messaging 1.4 XML namespace

* add support for the 1.4 messaging namespace (corresponding to 1.3.0
   mananagement model)

* managemement changes introduces in 1.4 XML / 1.3.0 management
  * new max-saved-replicated-journal-size attribute for hornetq-server
    resource
  * new group-timeout & reaper-period attributes for grouping-handler
    resource