NPE due to TCCL usage in clustering

AS7-635 has pointed out TCCL usage which is causing NPEs. If these descriptors are in the same module as the calling code, then it should just do Caller.class.getClassloader().

(see http://community.jboss.org/wiki/ModuleCompatibleClassloadingGuide for more info why)

Caused by: java.lang.NullPointerException
at org.jboss.as.clustering.jgroups.subsystem.ProtocolDefaultsService.find(ProtocolDefaultsService.java:95)
at org.jboss.as.clustering.jgroups.subsystem.ProtocolDefaultsService.load(ProtocolDefaultsService.java:85)
at org.jboss.as.clustering.jgroups.subsystem.ProtocolDefaultsService.start(ProtocolDefaultsService.java:76)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1675)
... 3 more

Caused by: java.lang.NullPointerException
at org.jboss.as.clustering.infinispan.subsystem.EmbeddedCacheManagerDefaultsService.find(EmbeddedCacheManagerDefaultsService.java:131)
at org.jboss.as.clustering.infinispan.subsystem.EmbeddedCacheManagerDefaultsService.load(EmbeddedCacheManagerDefaultsService.java:110)
at org.jboss.as.clustering.infinispan.subsystem.EmbeddedCacheManagerDefaultsService.start(EmbeddedCacheManagerDefaultsService.java:84)
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1675)
... 3 more