Function logging_plugin_from_properties 

pub fn logging_plugin_from_properties(
    props: &[(&str, &str)],
) -> Result<Option<Box<dyn LoggingPlugin>>, LogConfigError>

Build a LoggingPlugin from dds.sec.log.* properties, fanning out to every named sink. Returns Ok(None) if dds.sec.log.plugin is absent or names no sinks.