CONF_modules_free() closes down and frees up all memory allocated by
all configuration modules.
CONF_modules_finish() calls each configuration modules finish handler to free up any configuration
that module may have performed.
CONF_modules_unload() finishes and unloads configuration modules. If
all is set to 0 only modules loaded from DSOs will be
unloads. If all is 1 all modules, including builtin modules will
be unloaded.
NOTES
Normally applications will only call CONF_modules_free() at
application to tidy up any configuration performed.