added callback to log err when failing to register with apns
added callback to log err when failing to register with apns

jboss-developer/jboss-unifiedpush-quickstarts,jboss-developer/jboss-unifiedpush-quickstarts,jboss-developer/jboss-unifiedpush-quickstarts,jboss-developer/jboss-unifiedpush-quickstarts