Startup switches should set the new JGroups system properties

JGroups has created a more formalized system for the names of the system properties it uses (see http://wiki.jboss.org/wiki/Wiki.jsp?page=SystemProps). We need to ensure that when the JBoss AS command-line switches are used, the new system properties get set:

-b jgroups.bind_addr
-u jgroups.udp.mcast_addr

The old properties will be set as well to ensure legacy config files still work.