PLF-4469, PLF-5897 : Jgroups TCP vs UDP configuration
* UDP is by default
* TCP is activated by an exo profile (cluster-jgroups-tcp in standalone-exo-cluster.xml)
* Specific groups config files can be set with system properties or in exo.properties with something like :

exo.jcr.cluster.jgroups.config=${gatein.conf.dir}/jgroups/jgroups-jcr.xml
exo.jcr.cluster.jgroups.config.url=file:${exo.jcr.cluster.jgroups.config}
exo.idm.cluster.jgroups.config=${gatein.conf.dir}/jgroups/jgroups-idm.xml
PLF-5897 : EXT_CLU_DEF_2 Default indexation profil should be set to local. A profile (cluster-index-shared) must be used to switch back to shared indexes). cluster-index-local profile removed