locksrv: checkparcel: Clean up pre-commit special case
locksrv: checkparcel: Clean up pre-commit special case

- Clean up initialization for pre-commit sanity check

- Add pre-commit command line option to usage message

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr