client: Make isr_run_parcelkeeper() a generic wrapper
client: Make isr_run_parcelkeeper() a generic wrapper

- Make isr_run_parcelkeeper() a generic wrapper which runs PK with the mode
and arguments that are requested, in a way that doesn't require each caller
to write out the entire command line

- Update all PK callers to use this function

- Update for new PK syntax

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