client: Merge isr_sget() into its caller
client: Merge isr_sget() into its caller

- Merge isr_sget() into fetch_parcel_file(), its sole caller

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