Changelog

• Introduce syslog mode (-l). If set, all output is logged to syslog instead of stdout/stderr.
• Introduce one shot mode (-o). If set, the script performs exactly one I/O poll interval, then immediately spins down drives that were idle for the last POLL_TIME seconds, and exits.
• Skip NVMe drives during drive detection.
• Exit with an error, if no drives were found during drive detection.