Get a sorted list of the properties files in the directory.
Parameters: directoryPath - The directory. A sorted list of the properties files in the directory.
If the properties has any of the values we need to set as sakai system properties, set them.
Parameters: props - The property override configurer with some override settings.
Read in a property file.
Parameters: fileDirectory - The file's path. Parameters: propertyFileName - The file name. Parameters: loadMessage - A message to show after loading.