previously, audisp would read not only its configuration file (in
/etc/audisp/plugins.d/) but any files with names similar to its configuration
file found in the same directory, for example, backups of the configuration
file. As a result, if a plugin were listed in more than one configuration
file, it would be activated multiple times. audisp now filters out any file with a '.' in its name to avoid reading the backup files and therefore avoids activating multiple copies of plugins.