isr_admin: Don't require keyroot on command line
isr_admin: Don't require keyroot on command line

- For encrypt and decrypt operations, read the keyroot from parcel.cfg
rather than the command line

- Remove -k command line option

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