[WFLY-2469] Upgrade to HornetQ 2.4.0.CR1

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.CR1
  * 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)

* management model changes:
  * add max-saved-replicated-journal-size to hornetq-server resource
  * add group-timeout & reaper-period to grouping-handler resource
  * 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