Add two global config parameters allowing to parameterize the FILE log

handler of Wildfly:
* SERVER_LOG_BACKUP_MAX: the number of backup of the FILE log to
  maintain. Above this count, all the olders additional backups are
  deleted;
* SERVER_LOG_BACKUP_SIZE: the maximum size of the FILE log (the unity, m
  for megabyte for example, has to be indicated with the number).

By default, SERVER_LOG_BACKUP_MAX=10 and SERVER_LOG_BACKUP_SIZE=5m

Author: mmoqui

src/main/resources/default_config.properties

@@ -84,6 +84,10 @@ SILVERPEAS_LOGGING_LEVEL=WARNING
 SILVERPEAS_LOG_BACKUP_MAX=5
 SILVERPEAS_LOG_BACKUP_SIZE=20M
 
+## The server root logging parameters
+SERVER_LOG_BACKUP_MAX=10
+SERVER_LOG_BACKUP_SIZE=5m
+
 ## The name of the application context under which Silverpeas will be deployed.
 ## It defines the path in the URL at which Silverpeas is accessible in the Web. For instance:
 ### ${SERVER_URL}/${SILVERPEAS_CONTEXT} (http://localhost:8000/silverpeas with the default values).